Question

What is angle B?
A) 51
B) 129
C) 134
D) 141

Answer 1

Answer:

141

Step-by-step explanation:

The polygon has 7 sides so we can find the sum of the interior angles by

( n-2) * 180   where n is the number of sides

(7-2) * 180

900

Add up the interior angles

<A + <B + <C + <D + < E + <F + <G = 900

120 + <B + 148+ 90+ 142+ 130+ 129 = 900

759+ < B = 900

<B = 900-759

<B = 141

Answer 2

This is a heptagon which has 7 sides.
The sum of interior angles is (7-2)*180=900 degree
AngleD=90 since it is a right angle.
Subtract all the angles from 900 degree to find angleB
Final answer:
900-90-142-130-129-120-148=141 degree

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