Question

Given: m∠A = 3x+9
m∠B = 5x+20
m∠C= 3x
m∠D = 2x+6
Find m∠D.​

Answer 1

Answer:

sum of angles in a quadrilateral is 360

3x+9+5x +20+ 3x + 2x+ 6 = 360

13x +35 = 360

13x = 325

x =325/13

x = 25

angle D is 2(25) +6 =56