百度试题 结果1 题目The radius of a circle is half of its ___. A. diameter B. circumference C. area D. perimeter 相关知识点: 试题来源: 解析 A。本题考查圆的半径和直径的关系。半径是直径的一半。反馈 收藏
The area of a circle of radius r is πr2.The side-length of the square is2r, so the area of the square is(2r)2=4r2, The ratio is thusπr24r2=π4. 一个正方形的内接圆的半径是r,那么圆的面积与正方形面积是比是( ). A.2r B.π4 C.πr4 D.r4 圆的面积是πr2正方形的边长...
The radius of a circle is 5 cm. What is the area of the circle? A. 78.5 cm² B. 31.4 cm² C. 15.7 cm² D. 19.625 cm² 相关知识点: 试题来源: 解析 A。本题考查圆的面积计算,圆的面积公式为πr²,半径 r = 5cm,面积 = 3.14×5×5 = 78.5cm²。B 选项 31.4 是圆的...
The area of a circle with radius 4 cm is ___. A. 8π cm² B. 12π cm² C. 16π cm² D. 20π cm² 相关知识点: 试题来源: 解析 C。圆的面积等于πr²,半径为 4 厘米,面积是π×4²=16π 平方厘米。A 选项半径为 2 倍根号 2 厘米的圆面积约为 8π 平方厘米;...
百度试题 结果1 题目【题目】The radius of a circle is 18 meters. What is the circle's area?r=18 mUse 3.14 for . 相关知识点: 试题来源: 解析 【解析】Areaofircle=A2=3.14*(18)^2=3.14*18*18 =3.14*324 A=1017.36m^2 反馈 收藏
The radius of a circle is 4. What is the area of the circle? A. 8π B. 12π C. 16π D. 20π 相关知识点: 试题来源: 解析 C。圆的面积是π乘以半径的平方,半径为 4 时,面积是 16π。选项 A、B、D 的数值都不符合该圆的面积计算结果。
题目The area of a circle is 28.26 square meters. What is the radius of the circle? A. 3 meters B. 6 meters C. 9 meters D. 1.5 meters 相关知识点: 试题来源: 解析 A。圆的面积公式是:面积 = π×半径×半径,π取 3.14。28.26÷3.14 = 9,9 = 3×3,所以半径是 3 米。
A. diameter B. radius C. circumference D. area 相关知识点: 试题来源: 解析 B。本题考查圆的面积公式中各个字母的含义。'r'在圆的面积公式 A = πr²中代表半径(radius)。A 选项 diameter 是直径;C 选项 circumference 是周长;D 选项 area 是面积。反馈...
The radius of a circle is 5 cm. What is the area of the circle? A. 25π cm² B. 10π cm² C. 15π cm² D. 7.5π cm² 相关知识点: 试题来源: 解析 A。圆形面积公式为π×半径²,半径为 5cm,面积为 25π cm²。
The radius of the circle is cm, the diameter of the circle is cm, and the circumference of the circle is cm. (π≈3) 答案 5;10;30相关推荐 1The area of a circle is 75 cm2. The radius of the circle is cm, the diameter of the circle is cm, and the circumference of the ...