Given that the radius of a circle is 10cm, find the circumference and the area of the circle. (π=3.14) 答案 62.8cm, 314cm2.Circumference:2πr=2×3.14×10=62.8(cm),area:πr2=3.14×102=314(cm2).相关推荐 1Given that the radius of a circle is 10cm, find the circumference and th...
Task 1: Given the radius of a circle, find its area. For example, if the radius is 5 inches, then using the first area formula calculate π x 52= 3.14159 x 25 = 78.54 sq in. Task 2: Find the area of a circle given its diameter is 12 cm. Apply the second equation to get π...
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...
In this program, we will java Program see how to calculate the area of a circle when the radius is given.
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 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;...
To find the area of a circle with a given radius, we can use the formula: Area of a Circle = πr² Where: -π (pi) is a constant approximately equal to 3.14, - r is the radius of the circle. 1.Identify the radius: The radius given isr=√5cm. ...
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
Find the radius, r cm, of a circle, given that a sector of the circle has an area of (9π )8 cm2 and the sector subtends an angle of (π )4 radians at the centre of the circle. 相关知识点: 试题来源: 解析 3 cm 反馈 收藏 ...