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 ...
So, the area of the circle is 706.5 mm2 Example 2 Calculate the area of the circle shown below.SolutionA = πr2 square units = (3.14 x 282) cm2 = (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?
The area of a circle is:π (Pi) times the Radius squared:A = π r2 or, when you know the Diameter:A = (π/4) × D2 or, when you know the Circumference:A = C2 / 4πExample: What is the area of a circle with radius of 3 m ? Radius = r = 3 Area= π r2 = π× ...
The radius of a circle is the distance from the center of the circle to a point on the circle. Once you know this distance, you simply need to substitute the known value for r in the formula. Area = π× r2 Example #1 Using the area of a circle formula, calculate the area if the...
If the radius of the circle is the same as the diagonal of a square, what is the area of the square? (Take π=3.14) 一个圆形的面积为12.56厘米.若正方形的对角线和圆形的半径相同.求该正方形的面积.(取π=3.14) 相关知识点: 试题来源: 解析 2. 12.56÷3.14=4, ∴2×2÷2=2. 反馈 ...
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 straight line from the center of a circle to the edge is called the radius. A straight line that passes from one side of a circle to the other through the center is called the diameter. The distance around the outside of a circle is called the circumference. ...
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. 2.Substitute the radius into the area formula: Area=πr2=π(√5)2 ...
Calculate the area of a circle using the radius, diameter, or circumference with the circle area calculator. Radius: Diameter: Circumference: Area: Reset Add this calculator to your site On this page: Calculator How to Calculate the Area of a Circle Circle Area Formulas Find ...
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;...