Grade 4 Mathematics Quiz: Circles

What is the formula to find the circumference of a circle?

• 3.14r

• r^2

• 2πr

• 4πr

If the radius of a circle is 5 cm, what is its diameter?

• 10 cm

• 15 cm

• 3 cm

• 7 cm

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

• The radius is twice the length of the diameter.

• The diameter is twice the length of the radius.

• The radius and diameter are equal in length.

• The diameter is half the length of the radius.

What is the formula to find the area of a circle?

• A = πr^2

• A = 4πr

• A = 3r^2

• A = 2πr

If the radius of a circle is 8 cm, what is its circumference?

• 32π cm or approximately 100.48 cm

• 12π cm or approximately 37.68 cm

• 16π cm or approximately 50.24 cm

• 4π cm or approximately 12.56 cm

What is the value of pi (π) in mathematics?

• 2.71828

• 4.6692

• 5.6789

• 3.14159

If the diameter of a circle is 12 cm, what is its radius?

• 6 cm

• 10 cm

• 8 cm

• 3 cm

What is the name of the line segment that passes through the center of a circle and has its endpoints on the circle?

• diameter

• tangent

• chord

• radius

What is the name of the point inside a circle that is the same distance from every point on the circle?

• perimeter

• corner

• edge

• center

If the area of a circle is 64π square units, what is its radius?

• 16 units

• 4 units

• 8 units

• 12 units