Download 2.5 Supplementary Angles PowerPoint

Geometry 2.5
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You are at a party. You hear 2
of your friends talking about
SUPPPLEMENTARY ANGLES.
What does it mean?
1.
2.
3.
4.
They are spreading rumors
2 angles add up to 180 degrees
They need to get a life
You are at the wrong party
2
You are at a party. You hear 2
of your friends talking about
SUPPLEMENTARY ANGLES. What
does it mean?
1.
2.
3.
4.
They are spreading rumors
2 angles add up to 180 degrees
They need to get a life
You are at the wrong party
3
So A + B = 180 degrees
Example 1:
Angles A & B are supplementary.
Angle A = 80. What is angle B?
Answer:
Angle B is 100.
180 – 80 (Angle A) = 100 (Angle B).
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So A + B = 180 degrees
Example 2:
Angles A & B are supplementary.
Angle A = 4. What is angle B?
Answer:
Angle B is 176.
180 – 4 (Angle A) = 176 (Angle B).
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B
6

B
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
B
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
B
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2 Supplementary Angles are next
door neighbors in a high-rise
apartment building. One is 50 feet.
What is the other one?
50 + x = 180
x = 130

B
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Check your work.
Does 50 + 130 = 180?

B
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