Step 1: Write down the formula for the area of a circle.The area A of a circle is given by the formula:A=πr2where r is the radius of the circle. Step 2: Substitute the given area into the formula.We know the a
The area of a circle is 49π square meters. What is its radius? A. 7 meters B. 14 meters C. 21 meters D. 28 meters 相关知识点: 试题来源: 解析 A。本题考查圆的面积公式的逆运算。圆的面积公式是 S=πr²(S 是面积,r 是半径),已知面积是 49π 平方米,那么 r²=S÷π=49π÷...
The area of a circle is38.5cm2. Find its diameter (in cm). View Solution If the perimeter of a semi-circle is 144 cm, find its radius (in cm). View Solution The surface area of a sphere is 616cm2. Then, its radius is ……… cm. ...
A circular plate has an area of 16π square centimeters. What is its radius? A. 4 cm B. 8 cm C. 2 cm D. 16 cm 相关知识点: 试题来源: 解析 A。解析:圆的面积公式为πr²,已知面积为 16π,可得πr² = 16π,解得 r = 4cm。B 选项 8cm 代入面积公式结果为 64π 平方厘米;C ...
= (3.14 x 28 x 28) cm2 = 2461.76 cm2 Example 3 The area of a circle is 254.34 square yards. What is the radius of the circle? Solution A = πr2 square units 254.34 = 3.14 x r2 Divide both sides by 3.14. r2 = 254.34/3.14 = 81 Find the square root of both sides. ...
That is, $b \times h$ sq. units.TriangleWe can find the area of a triangle using the formula: $\frac{1}{2} \times \text{base} \times \text{height}$CircleThe area of a circle is calculated using the formula: $\pi r^2$, ...
A circle has a radius of 5 units. What is its area? A. 身己心文克热部太国律商适同高受身己心文克热部太国律商适同高受25π square units身己心文克热部太国律商适同高受身己心文克热部太国律商适同高受 B. 社了先党动社了先党动15π square units社了先党动社了先党动 C. 证十证...
The area of a circle is changing at a rate of {eq}2 \; in^2/sec {/eq}. At what rate is its radius changing when the radius is 9 inches? Rate of Change: We know that to find the rate of change of any function with res...
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
A circle is defined by a point, known as the centre, and a constant distance from this point, known as the radius. The total length of the boundary of the circle is referred to as the circumference. A significant aspect of circles in geometry is the area they enclose. In this article,...