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What is the measure of angle B in the triangle shown above?
А. 75
В. 180
С. 20
D. 70

What is the measure of angle B in the triangle shown above А 75 В 180 С 20 D 70 class=

Respuesta :

2x + 30 +3x + 15 + 3x -25 = 180
Add like terms 8x + 20 = 180 subtract 20 from both sides
8x = 160 Divide by 8 both sides
X= 20
Angle b is = 2x + 30 substitute x value
B = 2(20) + 30
B = 70 degree the answer is D
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D: 70 That is the measure of angle B in the triangle

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