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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
Intersecting lines:
When two lines intersect, adjacent angles are supplementary (they make a line and add up to 180
degrees, and vertical angles (angles across from each other are equal).
Parallel lines and transversals:
A line that cuts through two parallel lines is called a transversal. A transversal across parallel lines forms
four equal acute angles and four equal obtuse angles.
Here, line 1 is parallel to line 2. Angles a, c, e, and g are obtuse, so they are all equal. angles b, d, f, and
h are acute, so they are all equal.
Furthermore, any of the acute angles is supplementary to any of the obtuse angles (they make a line and
add up to 180°). Angles a and b are supplementary and so are angles a and d, so are angles a and h, and
so on.
Sample questions:
1. In the figure below, CD is parallel to AB, and PQ intersects CD at R and AB at T. If the measure of
angle CRP = 110°, then what is the measure of angle BTQ?
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
2. In the figure to the right. Lines l and m are parallel. Find the measures
of angles, 1, 2, 3, 4, 5, 6, and 7.
Interior angles of a triangle
The three interior angles of any triangle add up to 180°
Sample questions:
3. In triangle DEF at right, the measure of angle EDF is 35 and the
measure of DFE is 65. What is the measure of DEF? (label the
angles)
4. In triangle ABC, angle A is a right angle and angle B measures 30°. What is the measure of angle C?
(Draw a picture and label the angles. Remember that a right angle is 90°).
5. In the following figure, what is the value of X? (remember that supplementary angles = 180°)
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
Perimeter and Area of quadrilaterals and other polygons
Perimeter. Perimeter is the outline of a physical area. From Latin, meaning “around” (peri)and
“measure” (metron), a perimeter is basically a boundary of any kind, measuring around the shape. In
mathematics, perimeter refers to the length of this boundary. You might be asked to calculate
the perimeter of a polygon, which is the sum of the length of each side.
Area of a rectangle. From Latin: area - "level ground, an open space,". The number of square units it
takes to completely fill a rectangle. Formula: Width × Height.
Area of a square. The same as for a rectangle, but the width and height are the same so you can also
say 𝑠 2 where s is a side of the square.
Area of a parallelogram. width X height or (Base X Height)
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Area of a triangle. The formula for area of a triangle is 2 of the base times the height.
Area of a trapezoid. A trapezoid can be divided into 2 triangles, then add the two areas.
Sample questions:
6. A homeowner wants to put a wallpaper border on the top edge of all the walls of his kitchen. The
kitchen measures 6.5 meters by 4 meters. What is the required length, in meters, of the border?
7. What is the area, in square units, of the rectangle, shown in the standard (X,Y) coordinate plane
below?
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
8. What is the perimeter, in feet, of a rectangle with width 12 feet and length 20 feet?
9. What is the area of parallelogram ABCD?
10. A rectangular rug has an area of 35 square feet, and its width is exactly 2 feet shorter than its
length. What is the length, in feet, of the rug?
11. What is the perimeter, in meters, of the figure to the right?
12. What is the area, in square units, of the triangle shown in the standard (X,Y) coordinate plane
shown?
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
13. Andy made a model of the DPC Candy Store which has a side entrance accessed by a ramp. The
dimensions of the ramp on his model are 7 cm high and 24 cm wide. Andy decides to decorate the front
side of the ramp with candy tiles which are 1 cm square. How many candy tiles are needed to cover the
ramp?
14. In triangle XYZ shown, XS and SZ are 3 and 12 units, respectively. If the area of triangle XYZ is 45
square units, how many units long is altitude YS?
Pythagorean theorem
For all right triangles (triangles with a 90° angle), the square of the hypotenuse is equal to the sum of
the squares of the two sides.
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
Sample questions:
15. What is the length of the hypotenuse of the triangle below?
16. What is the length of side X in the triangle below?
17. What is the length, in inches, of the diagonal of a rectangle whose dimensions are 16 inches by 30
inches?
18. In the square ABCD shown, the length of AB = 4. What is the length of AC?
19. A zipline is installed from a tower 20 m high
crossing a river 50 m wide. What is the length of
the zipline wire?
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
Circumference of a circle
The perimeter of a circle is called the circumference. It is equal to the diameter times pi.
Area of a circle
The area of a circle is the radius squared multiplied by pi.
Sample questions:
20. The circle in the following figure is inscribed in a square with a perimeter of 24 inches. What is the
area of the shaded region in square inches?
21. Barbara's living room is a rectangle with the dimensions of 14 feet by 12 feet. If the room is
hardwood floor partially covered by a circular throw rug with a diameter of 8 feet, what is the
approximate area of hardwood floor, in square feet, that remains exposed?
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
22. In the figure below, the circumference of circle X is 12 𝜋 and the circumference of circle Y is 6 𝜋.
What is the length of XY?
This figure is for questions 23-24. In the following figure, the circle centered at P is tangent to the circle
centered at Q. Point Q is on the circumference of circle P. The length of QP = 6 inches.
23. What is the circumference of circle P?
24. What is the area, in square inches, of circle Q?
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
The figure below is for questions 25-27.
In the figure below, O is the center of the circle, C and D are points on the circle, and C, O, and D are
collinear. The length of CD is 16 inches.
25. What is the circumference, in inches, of the circle?
26. What is the length of radius, CO, in inches?
27. What is the area, in square inches, of the circle?
Volume of a rectangular solid
The volume of a rectangular solid is length
times width times height, in other words,
the area of the base times the height.
Volume of a cube is also length X width X
height, but all the dimensions are the same
so it can also be written V = 𝑠 3
28. What is the volume, in cubic inches, of the rectangular solid at right?
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
29. The recreation center has a swimming pool that is 50 meters long, 25 meters wide, and 2 meters
deep. The pool is surrounded by special non-slip tiles, as shown in the figure below. What is the volume
of water in the pool, in cubic meters, if the pool is only filled half-way?
30. A rectangular back yard pool is 10 meters long, 6 meters wide, and holds 120 cubic meters of water.
If the pool is the same depth in all parts, about how many meters deep is the water in the pool?
More on Parallelograms
A parallelogram has two pairs of parallel sides. Opposite sides are equal. Opposite angles are equal.
consecutive angles (angles adjacent to each other) add up to 180 °.
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
31. In the parallelogram shown at the right, angle A = 35°.
What are the measures of angles B, C, and D?
32. In parallelogram VWXY shown, points U, V, Y, and Z form a straight line. Given the angle measures
as shown in the figure, what is the measure of angle WVY? What is the measure of angle WXY? What is
the measure of angle XYZ?
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Math 1 Plane Geometry Part 1 Unit
Updated July 27, 2016
Answers:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
110°
1) 135°, 2) 45°, 3)135°, 4) 45°, 5) 45°, 6) 45°, 7) 135°
80°
60°
115°
21m
12 𝑢𝑛𝑖𝑡𝑠 2
64 feet
240 𝑢𝑛𝑖𝑡𝑠 2
7 feet
82 m
8 𝑢𝑛𝑖𝑡𝑠 2
84
6 units
17
16. 6√6 or 14.6969...
17. 34 inches
18. 4√2 or 5.6568...
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
10√29 or 53.8516...
36 - 9𝜋 or 7.74 𝑖𝑛2
168 - 16𝜋 or 117.76 𝑓𝑡 2
9
12𝜋 or 37.68 in
144𝜋 or 452.16 𝑖𝑛2
16𝜋 or 50.24 inches
8 in
64𝜋 or 200.96 𝑖𝑛2
120 𝑖𝑛3
1250 𝑚3
2m
B) 145°, C) 35°, D) 145°
angle WVY = 30°, angle WXY = 30°, angle XYZ = 30°
Resources for additional instruction and practice
Glencoe Mathematics Geometry pp. 46, 140, 174-399, 411-414, 520-589. 595-598, 601, 602, 610, 612,
688, 732-733
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