Question

an angle parallelogram is 20 degrees less than is adjacent angle . find the measure of all it's angles​

Answer 1

Step-by-step explanation:

let it's adjacent angle be x

the angle be x-20

we know that opposite angles of a parallelogram are equal

using angle sum property

x+(x-20)+x+(x-20)=360

x+x-20+x+x-20=360

4x-40=360

4x=360+40

4x=400

x=400/4

x=100

x-20=100-20=80

therefore it's all angles=100°,80°,100° and80°