求助 OG12 数学 DS 114

一只追梦的猫 · 发表于 2011-3-13 15:38:02

114：The length of the edging that surrounds circular garden K is 1/2 the length of the edging that surrounds circular gargen G.What is the area of garden K?(Assume that the edging has negligible width.)
(1)The area of G is 25 π square meters.
(2)the deging around G is 10π meters long.
求解答谢谢

一只追梦的猫 · 发表于 2011-3-19 20:20:53

自己顶一下

sdcar2010 · 发表于 2011-3-19 20:34:45

2*pai*radius = circumference

pai*radius*radius = area

You already knows the ratio between two radius equals 2. You only need to know either of the radius to figure out the area of K.

A) sufficient
B) sufficient

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求助 OG12 数学 DS 114

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