Question

in the adjacent figure AC ​

Answer 1

Answer:

2x +2x + x = 180. ( angle sum

5x = 180 property)

x = 36

angle ACD = 180 - angle ACB (linear pair)

= 180 - 36

= 144

but angle ACD = angle ACE + angle ECD

144 = 90 + angle ECD

angle ECD = 144 - 90

angle ECD = 54

angle ECD = 54