Solve pi/2operatorname{rad}

$$\frac { \pi } { 2 } \operatorname { rad }$$

Evaluate

$$\frac{\pi adr}{2}$$

Solution Steps

Express \frac{\pi }{2}r as a single fraction.

$$\frac{\pi r}{2}ad$$

Express \frac{\pi r}{2}a as a single fraction.

$$\frac{\pi ra}{2}d$$

Express \frac{\pi ra}{2}d as a single fraction.

$$\frac{\pi rad}{2}$$

Differentiate w.r.t. r

$$\frac{\pi ad}{2}$$