1 Answer

David Bick · Answer 1 · 2021-09-30T07:57:11+0000

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$l = R * \alpha$

$l = length \: \: of \: \: the \: \: arc$

$R = radius = 13 \: \: km$

$\alpha = mersure \: \: of \: \: the \: \: centeral \: \: angle \: \: between \: \: two \: \: radiuses \\$

Hint :

$\alpha \: \: must \: \: be \: \: in \: \: radian$

Thus ;

$\alpha = 45° = (\pi)/(4) \\$

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$l = 13 * (\pi)/(4) \\$

$l = (13)/(4) \pi \: \: km \\$

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