Question

i) ABCD is a parallelogram. The ratio of ∠A and ∠B of this parallelogram is 5 : 4. Find the

measure of ∠B =?​

Answer 1

Answer:

80°

Step-by-step explanation:

Let the ratio be 5x and 4x for <A and <B respectively.

We know that,

Sum of adjacent angles of Parallelogram is supplementary.

<A+<B=180°

5x+4x =180°

9x=180°

x= 20°

<B= 4(20°)= 80°