Download The word geometry comes from a Greek word meaning `to measure

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After completing the lesson,
students will demonstrate that they can
classify and name angles
and find their measures
by completing the lesson activities
and a homework assignment.
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The word geometry comes
from a Greek word
meaning 'to measure the
earth."
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Let's Review!
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Use words and symbols to describe each diagram.
1
2
3
4
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An angle ( ) is formed by two rays, or sides,
with a common endpoint called the vertex. You
can name an angle several ways: by its vertex,
by its vertex and a point on each ray, or by a
number. When three points are used, the middle
point must be the vertex.
Y
XYZ
ZYX
1
Let's Practice Naming Angles
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Give four names for each angle.
3
1
2
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Types of Angles
Acute Angle
Right Angle
Obtuse Angle Straight Angle
Classify each angle as acute, right, obtuse or straight.
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2)
1)
A.
B.
C.
D.
A.
B.
C.
D.
acute angle
right angle
obtuse angle
straight angle
acute angle
right angle
obtuse angle
straight angle
Classify each angle as acute, right, obtuse or straight.
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3)
4)
A.
B.
C.
D.
acute angle
right angle
obtuse angle
straight angle
A.
B.
C.
D.
acute angle
right angle
obtuse angle
straight angle
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45o
135
o
50
Complementary and Supplementary Angles YouTube.website
o
40
o
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Get Your Whiteboard!
Find the measure of the complement for each angle.
1)
2)
b=
3)
z=
c=
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hg
for eac
le
g
n
a
ary
gle.
iven an
t
plemen
m
o
c
e
h
Name t
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Match each angle to its supplement. We will click in the answers.
2)
1)
A)
B)
3)
4)
C)
D)
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When two lines intersect they form
four angles. Angles that have the same
vertex and whose sides are opposite rays
are called vertical angles, and they are
always congruent.
m
1=m
3
m
2=m
4
1
4
3
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pairs of vertical angles
a and b
c and d
m 1 = 37o
m 2=
m 3=
m 4=
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Congruent figures have the same size and shape.
The symbol
≅ means is congruent to.
What's the difference between
congruent and equal?
Only numerical measures
(such as the measure of an
angle or the length of a
segment) are called equal.
Figures that are the
same shape and size
are congruent.
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