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3 years ago

13

4. Marcella has 4 fewer male cousins than female cousins. Let f represent the number of female cousins. Write an expression for

the number of boy cousins.

1 answer:

sladkih [1.3K]3 years ago

4 0

F - 4 = number of boy cousins.

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3 years ago

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barxatty [35]

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<u>Formula</u>

$\textsf{Arc length}=r \theta$

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$\begin{aligned}\implies \textsf{Arc length} & =r \theta\\& = 15\left(\dfrac{5 \pi}{8}\right)\\& = \dfrac{75}{8} \pi \\& = 29.45\: \sf cm\:(2\:dp)\end{aligned}$

$\begin{aligned} \implies \textsf{Area of a sector}& =\dfrac{1}{2}r^2 \theta\\\\ & = \dfrac{1}{2}(15^2) \left(\dfrac{5 \pi}{8}\right)\\\\& = \dfrac{225}{2}\left(\dfrac{5 \pi}{8}\right)\\\\ & = \dfrac{1125}{16} \pi \\\\& = 220.89 \: \sf cm^2\:(2\:dp)\end{aligned}$

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