Download line of symmetry line intersecting endpoint degree (°) angle acute

Vocab
Lesson 14–4
Lesson 14–8
acute angle
acute triangle
B
A
Lesson 14–3
C
Lesson 14–4
angle
degree (°)
120°
Lesson 14–1
Lesson 14–2
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endpoint
intersecting
Lesson 14–1
Lesson 14–10
line
line GH
or
⎯
GH
line of symmetry
G
H
Ideas for Use
A triangle that has three acute angles.
Does a triangle contain line segments?
Explain.
The unit used to measure an angle.
Degree has more than one meaning. Write a
definition for a different meaning of the word.
Lines that meet or cross each other.
The Latin root sect means “cut.” How can this
help you remember the term intersecting?
• Develop categories for the words. Sort them
by category. Ask another student to guess
each category.
An angle with a measure that is greater than 0°
and less than 90°.
Write a tip about the difference between an
acute angle and an obtuse angle.
A geometric shape formed when two rays
share the same endpoint.
Draw examples of two different angles.
Circle the larger angle.
The point at the beginning of a ray or line
segment.
How many endpoints are on a ray? How
many endpoints are on a line segment?
The fold line indicating that a figure’s two
halves match exactly.
A straight set of points that extend forever in
opposite directions.
The prefix a- can mean “not, without.” Draw
an asymmetrical object in the space below.
Line is a multiple-meaning word.
Write a sentence using it as a verb.
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• Draw or write examples for each card.
Be sure your examples are different from
what is shown on each card.
Vocab
Lesson 14–1
Lesson 14–10
line segment
line symmetry
A
line segment AB
or
−−
AB
Lesson 14–4
B
Lesson 14–8
obtuse angle
obtuse triangle
R
G
T
Lesson 14–4
Lesson 14–2
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one-degree angle
Lesson 14–9
parallelogram
parallel (||)
Lesson 14–2
perpendicular (⊥)
Ideas for Use
• Design a crossword puzzle. Use the
definition for each word as the clues.
If a figure can be folded over a line so that
one half of the figure matches the other half,
it has line symmetry.
• Write a tally mark on each card every time
you use the word. Challenge yourself to
use at least 3 tally marks for each card.
A part of a line between two endpoints.
Explain the difference between a line and
a line segment.
How could you demonstrate to a friend that
a circle has line symmetry?
A triangle with one obtuse angle.
Name one way in which obtuse and acute
triangles are similar, and one way in which
they are different.
Lines that are always the same distance apart.
Parallel lines do not meet.
An angle that measures greater than 90° but
less than 180°.
Draw an obtuse angle and a right angle
below. Circle the obtuse angle.
1
An angle that turns through _ of a circle.
360
How many one-degree angles are in a cirlce?
Lines that meet or cross each other to form
right angles.
Find two examples of perpendicular line
segments in the room.
A quadrilateral with opposites sides equal
in length and parallel. Opposite angles have
the same size.
Describe the angles of the parallelogram
shown on this card.
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Give examples of three shapes that have at
least one set of parallel line segments.
Vocab
Lesson 14–1
Lesson 14–1
point
ray
•B
ray MN
or
⎯⎯
MN
Lesson 14–9
Lesson 14–9
rectangle
Lesson 14–4
rhombus
Lesson 14–8
∟
right angle( )
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M
Lesson 14–9
right triangle
Lesson 14–9
square
trapezoid
N
Ideas for Use
• Practice your penmanship! Write each
word in cursive.
A part of a line that has one endpoint and
goes on forever in one direction without
ending.
What does the multiple-meaning word ray
mean in this sentence? A ray of sunshine
shone on the wall.
A quadrilateral with 4 equal sides. Opposite
sides are equal in length and parallel.
Is a rhombus also a trapezoid? Explain.
• Work with a partner to name a part of
speech of each word. Consult a dictionary
to check your answers.
An exact location represented by a dot.
Write a sentence using the multiple-meaning
word point as a verb.
A quadrilateral with 4 right angles. Both sets
of opposite sides are equal in length, and the
other sides are parallel.
A triangle with one right angle.
An angle with a measure of 90°.
The word right has many meanings. Use a
dictionary to find a synonym and an antonym
for right.
Explain how perpendicular lines and right
angles are related.
A quadrilateral with exactly one pair of
parallel sides.
A quadrilateral with 4 right angles and
4 equal sides. Opposite sides are equal
in length and parallel.
Draw a trapezoid and a parallelogram below.
Circle the trapezoid.
Are all squares rectangles? Are all rectangles
squares?
Copyright © The McGraw-Hill Companies, Inc.
Solve this riddle: I am a place to play a sport.
A net divides each of my sides equally. I’m
shaped like a rectangle. What am I?