Question

a quadrilateral ABCD angle A : Angle B : angle C : angle d is equal to 3:4:6:7 find all angles of the quadrilateral hence prove that a b and d c are parallel to a d

Answer 1

angle a=3/20×360=54
angle b=4/20×360=72
angle c=6/20×360=108
angle d=7/20×360=126

Answer 2

let x be the angle
then the four angle will be 3x:4x:6x:7x

we know that on adding angles A, B, C and D we will get 360

so, a+b+c+d=360
20x =360
x=360/20
x=18

therefore 3x=54
4x=72
6x=108
7x=126.