题目 If the number of square units in the area of circle C is twice the number of linear units in the circumference of C, what is the number of square units in the area ?() A.4 B.8 C.4π D.8π E.16π 相关知识点: 试题来源: ...
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A circle has a diameter of 12 cm. What is the area of the circle? A. 12π cm² B. 24π cm² C. 36π cm² D. 48π cm² 相关知识点: 试题来源: 解析 C。圆的面积公式为πr²,直径是 12cm,半径就是 6cm,面积为π×6²=36πcm²,A 选项结果错误,B 选项结果错误,D...
In mathematics, the circumference of a circle is the distance around the circle's edge, and the area of a circle is the amount of space there is inside the circle's edge. We have a nice formula that relates the circumference of a circle and the area of a ci...
【考点】细节理解49.【答案】C【解析】根据最后一段中的 A spotlight lights up only one section of a stage; similarly, “spot sound” creates a circle of sound in on targeted area. This can be useful for businesses such as restaurants and stores because it offers a new way to attract ...
解析 C A unit circle's area is π, A circle with r=1.5 has area 2.25π=π+1.25π. 半径增加50%﹐面积增加( )%. A.50 B.100 C.125 D.150 一个单位圆的面积是π ,一个r=1.5的圆的面积是2.25π=π+1.25π. 故选C.反馈 收藏
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The area of a circle with a radius of 3 cm is ___ square centimeters. A. 3π B. 6π C. 9π D. 12π 相关知识点: 试题来源: 解析 C。本题考查圆的面积公式。半径为 3 cm 的圆的面积是 A = πr² = π×3² = 9π 平方厘米。反馈 收藏 ...
.3f表示保留小数点后面3位(四舍五入),如3.1415输出的结果就是3.142后面的那个点正常输出,就是句号.前面的.代表小数点,.和3要一起看,.3表示输出时显示三位小数,后面的点只是输出时原样输出的一个句号,对格式没有影响的前面的点是代表小数点与3组合就是保留小数位为三位，后面的点为结尾句号第...
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