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 The area of a 90-degree sector of a circle with radius 4 is the same as the area of a circle of radius 1. 相关知识点: 试题来源: 解析 FALSE 反馈 收藏
The area of a circle with a radius of 5 cm is ___. A. 25π cm² B. 10π cm² C. 5π cm² D. 75π cm² 相关知识点: 试题来源: 解析 A。本题考查圆的面积计算公式,圆的面积 = π×半径²。半径为 5cm,所以面积为 25π cm²。选项 B 计算错误,应为 25π cm...
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。
The area of a circle with a radius of 3 cm is equal to the area of a square. What is the side length of the square? A. 3 cm B. 3π cm C. 3√π cm D. 9 cm 相关知识点: 试题来源: 解析 C。解析:圆的面积为π×3×3 = 9π平方厘米。设正方形边长为 a,则 a×a = 9π,...
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 ...
Use the this circle area calculator below to find the area of a circle given its radius, or other parameters. To calculate the area, you just need to enter a positive numeric value in one of the 3 fields of the calculator. You can also see at the bottom of the calculator, the step-...
百度试题 结果1 题目 What is the area of a circle whose radius is thediagonal of a square whose area is 4 ?(A22BCA. 2元B. 2πyC. 4元D.8πE. 16π 相关知识点: 试题来源: 解析 D 反馈 收藏
解析 50.24;32The diagonal of the square is 8. Thus, the area of the square is 82÷2=32. The area of the square is 42×π=16π=50.24.We can conclude that the area of the circle is π2 of the area of the square. 反馈 收藏 ...
It has a crater with a diameter of ± 800 meters (north-south) and ± 600 meters (east-west). Meanwhile the danger area is a circle with a radius of 4 km from the center of Bromo crater.,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业