Question

give me ans of 4th question

Answer 1

The ratio of angles are 3:4:5:6

let the angles be- 3x+4x+5x+6x

3x+4x+5x+6x=360°. (sum of angles of quadrilateral is 360°)

18x=360°
x=360÷18
x=20
so,

3x=60°
4x=80°
5x=100°
6x=120°

prove AB || CD

angle BAD+ angle BCD

60°+120°= 180°
We know that sum of opposite angles of ||gm is 180°. And OPPOSITE sides of parallelogram are parallel. HENCE AB ||CD.
HENCE PROVED