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2011-09-20 18:51:00 来源：作文地带整理 双击单词自动翻译
作文地带导读：The center is given in the image: (–2, –1). All you need to finish the formula is the radius. We determine this by finding the distance from the center and the point, (2, –4), pictured on the circle: The radius of the ci
The center is given in the image: (–2, –1). All you need to finish the formula is the radius. We determine this by finding the distance from the center and the point, (2, –4), pictured on the circle: The radius of the circle is 5, so the equation of the circle can be written as (x + 2)2 + (y + 1)2 = 25.
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