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;...
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 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 ...
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 is calculated by___. A. π×radius B. 2×π×radius C. π×radius×radius D. π×diameter 相关知识点: 试题来源: 解析 C。圆的面积是π×半径×半径。易错点是容易记错圆面积公式。区分方法是多复习圆面积公式的推导过程。反馈...
Area of a circle in terms of radius: Area = π·r2 = 3.14·652 = 13270 square mm(*) Area of a circle in terms of diameter: Area = π·(d2)2 = 3.14·(1302)2 = 3.14·(65)2 = 13270 square mm(*) Area of a circle in terms of circumference: Area = C24π = 408.424π = 16...
七、英语数学(翻译)(10分)1.Find the area of a circle with a radius of 8 centimeters.2.A right triangle has one angle that measures90°.七、英语数学(翻译)(10 分) 1.Find the area of a circle with a radius of 8 centimeters. 2.A right triangle has one angle that measures 90°. ...
Find the area of a circle with a radius of 7 units.搜索 题目 Find the area of a circle with a radius of 7 units. 答案 解析 null 本题来源 题目:Find the area of a circle with a radius of 7 units. 来源: 越分练习题 收藏 反馈 分享...
1【题目】5Given that the area of a circle with radius 10 cm is equal to the area of asector with centralangle 40°, then the radius of the sector iscm. 25 Given that the area of a circle with radius 10 cm is equal to the area of a sector with centralangle 40°, then the radiu...
home▸sitemap▸geometry▸finding the area of a circle The area of a circle is found using the formula: In this formula, r is the radius of the circle. The image below shows what we mean by radius: How to Find the Area of a Circle Finding the area of a circle is easy. Questi...