The side length of a square is equal to the radius of a circle. It is known that the area of a square is a square cm. 1

The side length of a square is equal to the radius of a circle. It is known that the area of a square is a square cm. 1

The side length of a square = a
Radius of circle = a
S = pi * a ^ 2

Given that the area of the inner circle is 28.26 square cm, calculate the area of the outer circle square

26 / π = radius R2 = 9, so the diameter r = 2R = 6,
The circumscribed diameter of a circle is the side length of a square, so area = 62 = 36

What is the perimeter of a cylinder with a bottom radius of 11cm and a height of 2.5cm

11 * 2 * 3.14 = 69.08 (CM)
Rectangle is the sum of the length and width of the side expansion multiplied by two: (69.08 + 2.5) * 2 = 143.16 (CM)
A:

The side of a cylinder is square. The radius of the bottom of the cylinder is 5cm, and the height of the cylinder is 5cm______ ．

3.14 × 2 × 5 = 6.28 × 5 = 31.4 (CM). Answer: the height of the cylinder is 31.4 cm

For a cuboid, the sum of its length and width is 14cm, the sum of its width and height is 11cm, the sum of its length and height is 13cm, and its surface area is () and its volume is ()

Let the length be x, the width be y, and the height be Z
x+y=14
y+z=11
x+z=13
The solution is x = 8, y = 6, z = 5
Surface area = (8 × 6 + 8 × 5 + 6 × 5) × 2 = 236
Volume = 8 × 6 × 5 = 240