Area and Circumference

Front

What is the radius of a circle?

Back

A line from the center point to the edge of the circle.

Front

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

Back

Circumference = 2πr or Circumference = πd.

Front

If the diameter of a circle is 14 cm, what is the circumference?

Back

43.98 cm.

Front

Which of the following is not a radius: CA, CB, CD, LM?

Back

LM.

Front

What is the area of a semicircle with a radius of 5 cm?

Back

25.13 cm².

Front

What is the formula for the area of a circle?

Back

Area = πr².

Front

What does the diameter of a circle represent?

Back

A line that crosses through the center and touches each edge.

Front

How do you calculate the radius if you know the diameter?

Back

Radius = Diameter / 2.

Front

What is the relationship between diameter and circumference?

Back

Circumference = π × Diameter.

Front

If the radius of a circle is 7 cm, what is the area?

Back

Area = π(7)² = 153.94 cm².