Question

In a parallelogram A B C D , if angle A : angle B = 1 : 2 , then the measure of angle B is ​

Answer 1

Answer:

120

Step-by-step explanation:

as opposite angle are equal therefore angle a and c are equal which is 2x and angle b and angle c is eaqul which is 4x

now total sum of angle is 360

therefore 4x+2x=360

therefore x=60

therefore 2x = angle b=120°