Area and Circumference of Semi Circles

what is the formula for finding the area of a semi-circle

• A = π r²

• C = π r²

• A = π r² / 2

• A = 2 π r

Tags

CCSS.7.G.B.4

Mrs. Wilson placed the welcome mat shown below on her front door step. What is the area of her welcome mat in square feet? Leave in terms of π.

• 2π

• 8π

• 10π

• 4π

Tags

CCSS.7.G.B.4

Steven purchases a bowl. The diameter of the
bowl is 14 cm. What is the circumference of the 
bowl?

• 28 cm

• 43.98 cm

• 87.96 cm

• 7 cm

Tags

CCSS.7.G.B.4

The distance around a circle; much like the perimeter of a rectangle.

• perimeter

• diameter

• circumference

• radius

What is the circumference of a semicircle with a diameter of 14 cm (including the straight edge)?

Tags

CCSS.7.G.B.4

A semi-circle is half of a circle. How should the Area formula be changed so that it gives you the Area of a Semi-Circle?

Tags

CCSS.7.G.B.4

Calculate the area of the semi-circle. Use 3.14 for pi.

Tags

CCSS.7.G.B.4

Calculate the circumference of a semicircle with a radius of 5 feet (excluding the straight edge).

Tags

CCSS.7.G.B.4

A glass stained window is shaped like a semicircle. The bottom edge of the window is 36 inches long. How much colored glass would you need to cover the stained window? Round to the nearest hundredth.

• 1017.36 in²

• 508.68 in²

• 56.52 in

• 113.04 in

Tags

CCSS.7.G.B.4

what is the formula for finding the area of a semi-circle

• A = π r²

• C = π r²

• A = 1/2 π r²

• A = 2 π r

• A = 2π r²

Tags

CCSS.7.G.B.4