Question

I need help with this one, its too hard for me

Answer 1

• 
  `m\angle C+m\angle D=m\angle DEK`

`60+m\angle D=100`

`m\angle D=100-60`

• 
  `m\angle D=40`

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Hope it helps...

Answer 2

<C + <D = < DEK

<D = 40

Explanation:

The exterior angle is equal to the sum of the opposite interior angles

<C + <D = < DEK

60 + <D = 100

<D = 100 -60

<D = 40