lsanmartin225 lsanmartin225

11-02-2021
Mathematics

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I will give brainliest
What is the answer to this question

Please explain

I will give brainliestWhat is the answer to this questionPlease explain class=

Respuesta :

mhanifa mhanifa

11-02-2021

Answer:

156°

Step-by-step explanation:

∠3 is the exterior angle and:

m∠3 = m∠1 + m∠2

Substitute and solve for x

7x + 9 = 3x + 13 + 3x + 17
7x + 9 = 6x + 30
7x - 6x = 30 - 9
x = 21

Find the measure of ∠3

m∠3 = 7*21 + 9 = 147 + 9 = 156°

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