# Practice problems of the circle

A circle is a geometric shape that consists of all points that are a fixed distance, called the radius, away from a central point called the center. The distance around the circle is called the circumference and the region enclosed by the circle is called the area of the circle. The formula for the circumference of a circle is C = 2πr, where C is the circumference, r is the radius, and π is a mathematical constant, the Ludolph number, approximately equal to 3.1415926.The formula for the area of a circle is A = πr

^{2}, where A is the area and r is the radius.

The diameter of a circle is a line segment that passes through the center of the circle and has its endpoints on the circle. It is the longest distance across the circle and is also twice the length of the radius. The formula for the diameter of a circle is d = 2 * r, where d is the diameter and r is the radius. The diameter of a circle is an important measurement in geometry and is used in many mathematical formulas, such as the formula for the circumference of a circle (C = πd)

#### Number of problems found: 871

- The diameter

The diameter of a circle is 4 feet. What is the circle's circumference? - Circle area

Calculate the circle area with a radius of 1.2 m. - Calculate

Calculate the area of a circle whose radius is 5 dm. - Circle

What is the radius of the circle whose perimeter is 11 km? - Round cake

What is the area of a round cake with a radius of 5cm? - Circle simple

The circumference of a circle is 6.28. What is the area of the circle? - Perimeter to area

Calculate the area of a circle with a perimeter of 15 meters. - Diameter to area

Find the area of a circle whose diameter is 26cm. - Calculate 48493

Calculate the length of the circle if d = 10 cm. - Calculate 2948

Calculate the length of a circle with a diameter of 7 cm. - Circle - easy 2

The circle has a radius of 6 cm. Calculate its diameter, perimeter, and area: - Tree trunk

Calculate the average tree trunk with a circumference of 149 cm. - Circumference 29361

What is the circumference and area of the circle if r = 18cm - Wheel diameter

A 1m diameter wheel rolled along a 100m long track. How many times did it turn? - Increase 4957

How does the area of a circle change if we double its radius? How many times does its area increase? - Bicycle wheel

After driving 157 m bicycle wheel rotates 100 times. What is the radius of the wheel in cm? - Cable

The cable consists of 8 strands. Each strand consists of 12 wires with a diameter of d = 0.5 mm. Calculate the cross-section of the cable. - Clock

How long is the trajectory of the second hand of hours for day, if it is 15 mm long? - Determine 21053

Determine the radius of a circle whose length is 21.98 cm - Illuminates 4961

The lamp illuminates a circle with a diameter of 10m. What area does the light illuminate?

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