Radius and Diameter

Front

What is the definition of a radius?

Back

A radius is a straight line from the center of a circle to any point on its circumference.

Front

What is the definition of a diameter?

Back

A diameter is a straight line that passes through the center of a circle and touches two points on its circumference.

Front

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

Back

The diameter is 10 cm (Diameter = 2 x Radius).

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius.

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 12 inches, what is its radius?

Back

The radius is 6 inches (Radius = Diameter / 2).

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a radius of 3 m?

Back

The circumference is approximately 18.84 m (Circumference = 2πr).

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 4 ft?

Back

The area is 50.27 ft² (Area = πr²).

Tags

CCSS.7.G.B.4

Front

How do you find the radius if you know the circumference?

Back

Use the formula: Radius = Circumference / (2π).

Tags

CCSS.7.G.B.4

Front

What is the formula to calculate the diameter from the area of a circle?

Back

Diameter = 2 * √(Area/π).

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is doubled, what happens to the diameter?

Back

The diameter also doubles.

Tags

CCSS.7.G.B.4