Calculating Area, Perimeter and Circumference

What is the radius of this circle?

• 18
• 6
• 24
• 4

A _____ is half of a circle.

• circumference

• pi

• semicircle

• composite figure

Find the perimeter of the semicircular region. Round your answer to the nearest hundredth.

• 23.13 m

• 28.26 m

• 14.13 m

• 56.52 m

Find the area of this Semicircle with a diameter of 18 cm

• 254.34 cm
• 127.17 cm
• 56.52 cm
• 28.26 cm

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2

• Subtract 2 from the diameter

• Add 2 to the diameter

• Divide the diameter by 2

Mrs. Wilson placed the welcome mat shown below on her front door step. What is the PERIMETER of her welcome mat in feet? Round to the nearest hundredth. Don't forget to label.

Maria wants to put trim around her artwork. Use the image to calculate how many inches of trim Maria would need.

• 16 inches

• 22 inches

• 26 inches

• 44 inches

Area of triangle?

• 17 units²
• 20 units²
• 10 units²
• 16 units²

Give the most precise name of the figure and the correct formula(s) to find the area.

• Triangle

• Trapezoid

• 
• 
• 

Find the area of the trapezoid.

• 18 m²
• 165 m²
• 84 m²
• 22.5 m²