Circles Test Review

Front

What is the formula for the area of a circle?

Back

The area of a circle is given by the formula: A = πr², where r is the radius of the circle.

Front

How do you convert degrees to radians?

Back

To convert degrees to radians, use the formula: radians = degrees × (π/180).

Front

What is the area of a sector of a circle?

Back

The area of a sector is given by the formula: A = (θ/360) × πr², where θ is the angle in degrees and r is the radius.

Front

What is the relationship between the circumference and the diameter of a circle?

Back

The circumference (C) of a circle is related to its diameter (d) by the formula: C = πd.

Front

What is the value of π (pi)?

Back

π (pi) is approximately equal to 3.14 or 22/7.

Front

How do you find the circumference of a circle?

Back

The circumference of a circle can be found using the formula: C = 2πr, where r is the radius.

Front

What is the formula for the area of a circle in terms of diameter?

Back

The area of a circle can also be expressed as A = (π/4)d², where d is the diameter.

Front

How do you convert radians to degrees?

Back

To convert radians to degrees, use the formula: degrees = radians × (180/π).

Front

What is the area of a circle with a radius of 3 cm?

Back

Using the formula A = πr², the area is A = π(3)² = 9π cm², approximately 28.27 cm².

Front

What is the formula for the length of an arc in a circle?

Back

The length of an arc (L) is given by the formula: L = (θ/360) × 2πr, where θ is the angle in degrees and r is the radius.