Question

Verify that a+(b+c) = (a+b)+c by taking a = 1/2, b=3/4 c= -2/3

Answer 1

Answer:

ANS : 70

Step-by-step explanation:

According to figure,,

angle,, A + B = 180° -- (rule) -- 1st eq.

angle,, A - B = 40° -- (given) -- 2nd eq.

Adding 1st and 2nd eq.

angle,, 2A = 220°

angle A = 110°

So, angle B = 70°

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