Correct Answer: Option C

Explanation

A\(\bigtriangleup\) = \(\frac{1}{2}\) x 8 x h = 20

= \(\frac{1}{2}\) x 8 x h = 4h

h = \(\frac{20}{4}\) = 5cm

A\(\bigtriangleup\)(PQTS) = L x H

A\(\bigtriangleup\)PQRT = A\(\bigtriangleup\)QSR + A\(\bigtriangleup\)PQTS

20 + 50 = 70cm\(^2\)

ALTERNATIVE METHOD

A\(\bigtriangleup\)PQRT = \(\frac{1}{2}\) x 5 x 28

= 70cm\(^2\)

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