# Math Help - Finding area and angles with sine ratio

1. ## Finding area and angles with sine ratio

The area of acute-angled isosceles triangle PQR is 8cm squared. PQ = QR = 6cm. Find angle PQR to 2 decimal places.

$Area = \frac{1}{2}a^{2}sin{\theta}=8$
$18sin{\theta}=8$
$sin{\theta}=\frac{4}{9}$
${\theta}=sin^{-1}(\frac{4}{9})$