The radius of a circle is 2 cm. How many square meters is the area of the circle

The radius of a circle is 2 cm. How many square meters is the area of the circle

twelve point five six

The radius of a circle is 2.58 meters. What is the area of the circle?

Area s = π × radius & # 178; = 3.14 * 2.58 & # 178; = 20.90 square meters. The area of this circle is 20.90 square meters. I'd like to give you a good answer,

If the radius of a circle is increased by one fifth, its area will be increased by 55 square meters?

Let the original radius be r, then the original area = π R ^ 2. If the radius increases by 1 / 5, then the radius becomes (1 + 1 / 5) r = 6R / 5, then the area of the circle = π (6R / 5) ^ 2 = 36 π R ^ 2 / 25, so the increased area = 36 π R ^ 2 / 25 - π R ^ 2 = 11 π R ^ 2 / 25 = 55, so π R ^ 2 = 125, so the original area is 125 m2

Draw the largest circle in a square. The circumference of the circle is 62.8 cm. What is the circumference of the square?
Determinant!

62.8÷3.14＝20
20 × 4 = 80 cm

Draw the largest square in a circle. Which circumference does the circumference of the circle compare with that of the square

The circumference of a circle

The side length of a square is 1cm, and the diameter of a circle is 1cm. What is the ratio of the circumference of a square to that of a circle? What is the ratio of the area of a square to that of a circle
What is the ratio

The perimeter ratio is: (1 + 1 + 1 + 1): π * 1 = 4: π
The area ratio is: (1 * 1): π (1 / 2) &# 178; = 4: π

The circumference of a circle with a diameter of 4cm is shorter than that of a square with a side length of 4cm
2. If the number of a is 4 / 5 of that of B, the ratio of B to a is 5:4 ()

1. Right
2. Right

In a square with a circumference of 16 cm, draw the largest circle with a circumference of () cm and an area of () square cm
Take the formula

The diameter of a circle is equal to the side length of a square, which is 16 △ 4 = 4cm
Its circumference is 3.14x4 = 12.56cm
The radius is 4 / 2 = 2 cm
The area is 2x2x3.14 = 12.56 square centimeters

The perimeter of a square is equal to that of a circle. Given that the side length of a square is 3.14 cm, what is the radius of a circle?

The side length of the square is 3.14 cm
The perimeter of the square is 3.14 * 4 = 12.56 cm
The circumference of the circle is also 12.56 cm
The radius of the circle is 12.56/3.14/2 = 2 cm

The perimeter of a regular shape is equal to that of a circle. Given that the side length of a square is 3.14 cm, what is the radius and area of the circle?

Circle radius = 3.14 × 4 △ 3.14 △ 2 = 2cm
Area = 3.14 × 2 & # 178; = 12.56 square centimeter