Evaluate the integral. $\int_{0}^{1 / 2} \frac{4 d r}{\sqrt{1-r^{2}}}$
A) $\frac{\pi}{4}$
B) $\frac{1}{5}$
C) $\frac{\pi}{5}$
D) $\frac{1}{4}$
E) $\frac{2 \pi}{3}$

Question

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The Answer of Evaluate the integral. $\int_{0}^{1 / 2} \frac{4 d r}{\sqrt{1-r^{2}}}$
A) $\frac{\pi}{4}$
B) $\frac{1}{5}$
C) $\frac{\pi}{5}$
D) $\frac{1}{4}$
E) $\frac{2 \pi}{3}$

Evaluate the Integral ∫01/24dr1−r2\int_{0}^{1 / 2} \frac{4 d r}{\sqrt{1-r^{2}}}∫01/2​1−r2​4dr​ A) π4\frac{\pi}{4}4π​ B) 15\frac{1}{5}51​

Evaluate the Integral $\int_{0}^{1 / 2} \frac{4 d r}{\sqrt{1-r^{2}}}$ A) $\frac{\pi}{4}$ B) $\frac{1}{5}$