# If sides A and B of a triangle have lengths of 10 and 1 respectively, and the angle between them is pi/2, then what is the area of the triangle?

Area of the triangle is $= 5$ sq units.
Sides A=10 ; B=1 and angle between them is $\angle C = \frac{\pi}{2} = \frac{180}{2} = {90}^{0}$ This is a right angled triangle. So area of the triangle$= \frac{1}{2} \cdot A \cdot B = \frac{1}{2} \cdot 10 \cdot 1 = 5$ sq units [Ans}