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11-09-2016
Mathematics

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If m∠ABC = 72°, what is m∠DAB?

A) 72°
B) 108°
C) 144°
D) 216°

If mABC 72 what is mDAB A 72 B 108 C 144 D 216 class=

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Аноним Аноним

11-09-2016

∠ABC=∠CDA=72º
∠DAB=∠BCD=x

∠ABC+∠CDA+∠DAB+∠BCD=360º

Therefore:
72º+72º+x+x=360º
144º+2x=360º
2x=360º-144º
2x=216º
x=216º/2
x=108º

So, ∠DAB=∠BCD=x=108º

Answer: ∠DAB=108º (B)

Answer Link

9cakaolisa 9cakaolisa

21-04-2020

B) 108°

Answer:

B) 108°

Step-by-step explanation:

Answer Link

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