Circles- Radius & Diameter

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

• 8 inches

• 10 inches

• 12 inches

• 6 inches

If the radius of a circle is 10 meters, what is the area of the circle? (Use A = πr²)

• Approximately 314.16 square meters.

• Approximately 157.08 square meters.

• Approximately 78.54 square meters.

• Approximately 100 square meters.

What is the definition of a radius?

• The radius is the distance from the center of a circle to any point on its circumference.

• The radius is the length of a line segment that connects two points on a circle.

• The radius is the total distance around the circle.

• The radius is the diameter of the circle divided by two.

Is the line segment from the center to the edge of the circle called the radius or diameter?

• Radius

• Diameter

• Chord

• Circumference

If the diameter of a circle is 14 inches, what is the radius?

• 5 inches

• 6 inches

• 7 inches

• 8 inches

What is the formula to find the radius if the diameter is known?

• Radius = Diameter / 2

• Radius = Diameter x 2

• Radius = Diameter + 2

• Radius = Diameter - 2

If a circle has a radius of 3 feet, what is its diameter?

• 4 feet

• 5 feet

• 6 feet

• 7 feet

What is the definition of a diameter?

• The distance across a circle through its center, equal to twice the radius.

• The length of a line segment that connects two points on a circle's circumference.

• The distance from the center of a circle to any point on its circumference.

• The perimeter of a circle divided by pi.

If the diameter of a circle is 30 inches, what is the radius?

• 10 inches

• 12 inches

• 15 inches

• 20 inches

What is the relationship between radius and diameter?

• The diameter is always twice the length of the radius.

• The radius is always twice the length of the diameter.

• The diameter is half the length of the radius.

• The radius and diameter are equal.