Unit 3 End Of Unit

Front

What is the formula for finding the area of a circle?

Back

A = π·r²

Front

What is the radius of a circle?

Back

The radius is halfway through a circle.

Front

A circular rug has a diameter of 14 inches. What is the area in square inches of the rug?

Back

49π

Front

If a circular rug has a diameter of 14 inches and a border of 2 inches wide, what is the combined area of the rug and border?

Back

81π

Front

Find the area of the part of the figure that is shaded if the area of the triangle is 150 sq. cm. Round your answer to the nearest whole number. Use 3.14 for π.

Back

37 cm²

Front

What is the formula for the circumference of a circle?

Back

C = 2·π·r or C = π·d

Front

What is the diameter of a circle?

Back

The diameter is a line that passes through the center of a circle, connecting two points on its edge.

Front

How do you calculate the area of a circle using the diameter?

Back

Use the formula A = π·(d/2)².

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the radius (d = 2·r).

Front

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

Back

A = π·(5)² = 25π.