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a_sh-v [17]
3 years ago
15

∡C and ∡D are supplementary angles. If m∡D is nine less than twice m∡C, find m∡D.

Mathematics
1 answer:
Gala2k [10]3 years ago
6 0

Answer:

D is 117

Step-by-step explanation:

Let the measure of angle C be x

The measure of D is 9 less than twice C

Mathematically that is 2x-9

If both are supplementary, they add up to be 180

Thus;

x + 2x - 9 = 180

3x = 180 + 9

x = 189/3

x = 63

Recall;

D = 2x-9= 2(63) -9 = 126 -9 = 117

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