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;...
If you want to find the area of a circle with a radius of 5, what formula should you use? A. A = πr² B. A = 2πr C. A = πd D. A = r² 相关知识点: 试题来源: 解析 A。解析:求圆的面积公式是 A = πr²,B 选项是圆的周长公式;C 选项是圆的周长公式中直径表示...
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× ...
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-...
Find the area of a circle whose radius is 15 mm. Solution A = πr2 square units By substitution, A = 3.14 x 152 = (3.14 x 15 x 15) mm2 = 706.5 mm2 So, the area of the circle is 706.5 mm2 Example 2 Calculate the area of the circle shown below.SolutionA...
百度试题 结果1 题目Calculate the area of a circle with a radius of 7 cm.相关知识点: 试题来源: 解析 Area = π(radius)^2 = π(7)^2 ≈ 反馈 收藏
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
Notice that the unit (inches) is squared to show that it was multiplied by itself twice. Example #2 Calculate the area if the radius is 6 inches. Area = pi × r2= 3.14 × 62= 3.14 × 36 = 113.04 in.2 How to find the area of a circle using the diameter ...
Find the area of this circle. The radius is 2.6 cm. Find the area of a circle whose radius is 2.78 cm? What is the circumference and the area of a circle that has a diameter of 35 cm? If the diameter of a circle is 5 cm, what is the circumference and area of the circle?
The area of a circle is represented as A . On the other side of the equation we have π (Pi) multiplied by r2 (radius) squared. A common mnemonic for remembering this formula you have learned in school is: "Pie are squared". Repeat that a few times to ensure you can quickly recall...