Question

Find x
(4+25)
(6x+20)
(3x+25)

Answer 1

x=15º

Explanation:

Sum of quadrilateral interior angles;

(4x + 25) + (3x + 25) + (6x + 20) + 180-(4x + 25)=360

3x + 25 + 6x + 20 + 180 =360

9x = 360 - 225

9x = 135

x = 15º

Answer 2

x = 15

Explanation:

the opposite angle of a cyclic quadrilateral sum to 180° , then

6x + 20 + 3x + 25 = 180

9x + 45 = 180 ( subtract 45 from both sides )

9x = 135 ( divide both sides by 9 )

x = 15