Question

In the figure, find the measures of angleACB, angleECD and angleAED.
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Answer 1

Here is ur answer

in the triangle ACB

angle-AB+ angle  BC+ angle AC=180(angle sum property)

therefore,20+100+AC=180

120+AC=180

ACB=180-120=60

To find angle ECD

BCE+ECD=180(linear pair)

60+ECD=180

ECD=120

In the triangle ECD

ECD+EDC=AED(exterior angle property)

120+25=145

therefore AED= 145

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