Answer
$\approx 29.96$ square unit
Work Step by Step
The triangle has sides of length 7 unit and 9 unit , with included angle $72^{0}$. Therefore-
Area, (A) of the triangle,
A = $ \frac{1}{2}$ a b $\sin \theta$
= $ \frac{1}{2} \times a\times b \times \sin \theta$
= $ \frac{1}{2} \times 7\times 9 \times \sin 72^{0}$
= $\frac{1}{2}\times63\times0.9510565$
$\approx 29.96$ square unit
