Question

the angles a,b,c and d of a quadrilateral abcd are in the ratio 2:4:5:7. find measure of these angles. what type of quadrilateral is it? give reasons.

Answer 1

2x+4x + 5x + 7x=360
18x = 360
x = 20
each angle is 2*20=40

Answer 2

2x+4x+5x+7x=360
18x=360
X=360/18
X=20
Angles are 40,80,100,140