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My
Geometry
Book
Line Segment:
Line:
Point:
-A part of a ___
between __ endpoints
-Goes on forever in ____
directions; must have
______ on both ends
-An exact position in
____
Find the missing angle in the quadrilaterals below
A=90°
C=
B=90°
D=90°
A=65°
C=115°
B=
D=115°
A=110°
C=70°
The sum of the angles in any quadrilateral is ______
degrees
Angle Relationship
B=
D=110°
ANGLE RELATIONSHIPS
Find the missing angle in the triangles below.
A = 60°
A=
A = 120°
B = 60°
C=
B = 90°
B = 30°
C = 45°
C=
The sum of the angles in any triangle is __________ degrees.
Ray:
Angle:
Vertex:
-part of a line with __
endpoint that goes on
forever in __ ___________
-2 rays that ______ an
endpoint
-the point at which __ line
segments, lines, or rays ____
to form an angle
Polygon:
Regular Polygon:
Plane:
-a ______ figure formed
from line segments that
meet only at their ________
-a _______ with all sides the
same length & all angles the
_____ measure
-a flat _______ that extends
infinitely in all __________
Basic Geometric Figures
LINES
Parallel Lines:
Perpendicular Lines:
Intersecting Lines:
-Lines that will _____
intersect
-Lines that _________
at right angles
-Lines that “_____” or
“____”; think of a
street intersection
Triangles can also be classified according to the length of
their sides.
Equilateral Triangle
-All 3 sides are
__________
-All 3 angles are
__________
Isosceles Triangle
-____________________
____________________
-2 angles, called the base,
are congruent
Triangles
Scalene Triangle
-No _____ are congruent
-No _____ are congruent
TRIANGLES
Triangles can be classified according to their angles
Acute Triangle
Obtuse Triangle
-All 3 ______ are acute
(less than 90°)
Acute Angles:
-measures _____
________ 90°;
think “a little
cute angle”
-Exactly 1 _____ is an
obtuse angle
Obtuse Angles:
-measures _____
______ 90° but
______ _______
180°
Right Triangle
-Exactly ___________
__________________
-the acute angles are
complementary
Right Angles:
-measures ___°;
think of a
“perfect corner”
Lines and Angles
Straight Angles:
-measures ___°;
think of a
straight line
QUADRILATERALS
A Quadrilateral is a 4-sided polygon. The sum of the 4 angles of
any quadrilateral is 360°
Rhombus
Square
-Consecutive ______ are supplementary
-Both pairs of opposite _____ are
________
-All sides are __________
-Both pairs of opposite _____ are
congruent
Parallelogram
-Both pairs of opposite
_____ are parallel
-Both pairs of opposite
sides are __________
-Both pairs of opposite
______ are congruent
-Consecutive ______ are
supplementary
-Both pairs of opposite _____ are
parallel
-All sides are __________
-All pairs of adjacent _____ are
perpendicular
-All angles are _____ _____
Rectangle
-Both pairs of opposite
_____ are parallel
-Both pairs of opposite
sides are __________
-All pairs of adjacent
sides are ____________
-All angles are _____
angles
Quadrilaterals
Trapezoid
-Exactly ____ pair of
opposite sides is parallel
-Exactly two pairs of
consecutive ______ are
supplementary