Question

answer the question

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Answer 1

Answer:

Angle ADB = 140°

Step by step explaination is given in the attached pic.

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Answer 2

inABC , using angle sum property

angle A +angle B + angle C = 180°

angle A +angle B + 100°= 180°

angle A +angle B = 80° ----------- equation 1)

• angle 1= ½ angle B

• •

therefore, in eq. 1) divide both sides by 2

angle A + angle B = 80°

______ ______ __

2 2 2

angle 1 + angle 2= 40° --------------2)

In ADB

angle 1 + angle 2 + angle D = 180°

( angle 1 + angle 2 ) + angle D = 180°

40° + angle D = 180°

angle D =140°