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Hikari93
 3 years ago
semicircle R ~ semicircle S
r/s=3/5
Area of semicircle S = 75π cm2
Area of semicircle R = ?
Hikari93
 3 years ago
semicircle R ~ semicircle S r/s=3/5 Area of semicircle S = 75π cm2 Area of semicircle R = ?

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3pwood
 3 years ago
Best ResponseYou've already chosen the best response.0The formula for the area of a circle is \[\pi r^2\] So in other words, the area depends on radiussquared Assuming the two semicircles are similar fractions of the total circle, the ratio between the two areas should be the ratio between the radii squared: So AreaR/AreaS = (r/s)^2 AreaR/75pi = (3/5)^2 AreaR = 75pi * 9/25 AreaR = 27pi
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