Question

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Answer 1

$13) \: S= \frac{1}{2} (1)(5) {}^{2} \\S = \frac{25}{2}$

$3) \: L = θ \times r \\ L = ( \frac{60\pi}{180} )12 \\ L = 4\pi$

$4) \: S = ( \frac{4 + 2}{2} ) \times 4 \\ S = ( \frac{6}{2} ) \times 4 \\ S = 3 \times 4 \\ S = 12$

$6) \: S = \frac{1}{2} \times \frac{36\pi}{180} \times {2}^{2} \\ S = \frac{144\pi}{360} \\ S = \frac{2\pi}{5}$

$7) \: S = \frac{2\pi \times 8}{2} \\ S = \frac{16\pi}{2} \\ S = 8\pi$