pi*radius squared = 81 square units
Divide both sides by pi and then square root both sides to find the value of the radius.
radius = 5.077706252 or 5 units in length to one significant figure
2 times radius = diameter = 10 units in length
The radius of a circle is always half of the diameter. Therefore, if the diameter of a circle is 36 units, the radius would be half of 36, which is 18 units. The formula for finding the radius from the diameter is radius = diameter / 2. So, in this case, the radius would be 18 units.
The radius of the circle is the length between the middle of the circle and any of the sides. It is also half the lenght of the diameter.
The radius of a circle is half the diameter.
The radius is 1/2 of the diameter, so if the radius is 20 units then the diameter is 40 units. You multiply the radius by 2 to get the diameter.
Circumference = 2 x pi x radius = 24 pi 2 x radius = 24 ; radius = 12 units
A circle with a radius of 2 units has an area of 12.57 square units.
1,438.72 square units.
The square of the diameter of a circle is equal to four times the square of the radius of the circle. This relationship arises from the formula for the diameter of a circle, which is two times the radius, and squaring both sides of this equation.
8 units; the diameter of a circle is twice its radius.
diameter = 30 units area = 225*pi square units
The radius of the circle is 1.5 units and the diameter is 3 units.
The radius of a circle is always half of the diameter. Therefore, if the diameter of a circle is 36 units, the radius would be half of 36, which is 18 units. The formula for finding the radius from the diameter is radius = diameter / 2. So, in this case, the radius would be 18 units.
Radius = 1/2 of the diameter = 30 units
The radius of the circle is the length between the middle of the circle and any of the sides. It is also half the lenght of the diameter.
The radius of a circle is half the diameter.
radius = diameter/2 area of a circle in square units = pi*radius2
The radius is 1/2 of the diameter, so if the radius is 20 units then the diameter is 40 units. You multiply the radius by 2 to get the diameter.