Question

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Answer 1

Answer:

let triangle ABC=x

triangleBDE+triangleCFD+triangleBDC+triangleABC=360°.

=70°+30°+70°+x=360°.

=170°+x=360°.

=x=360°-170°

x=190°;triangle ABC=190°

therefore the area of triange ABC in cm^2 is equal to 190°..

Answer 2

Answer:

let triangle ABC=x

by using triangle formula ....

Triangle BED+triangleCFD+triagleBDC+triangleABC

70+30+70+x=360

170+x=360

x=360-170

x=190 cm^2

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