Answer :

clicker786

Answer:

x = 20

Step-by-step explanation:

a triangle is 180 degrees

ECD = ACB

therefore ACH

= 3x - x

= 2x

for the triangle ACH

2x + 2x + 100 = 180

4x = 180 - 100

4x = 80

x = 80/4

x= 20