LC 3 Corrections

The radius of a circular clock is 10.5 inches. What is the circumference of the clock? Use 3.14 for pi.

• 86.55 in

• 346.19 in

• 65.94 in

• 32.97 in

The radius of a circular clock is 10.5 inches. What is the area of the clock? Use 3.14 for pi.

Find the circumference of the plate below to the nearest tenth. Use 3.14 for π.

• 1419.8 cm

• 452.2 cm

• 75.4 cm

• 37.7 cm

The top surface of a desk is composed of 2 rectangles and a triangle. Some side lengths of the top surface of the desk are shown. What is the area of the top surface of the desk in square feet?

Mrs. Jordan is looking to replant grass in her rectangular backyard. She does not want to cover her patio, which is in the shape of a semicircle,  with grass. The diagram below shows the dimensions of Mrs. Jordan’s backyard. 

Which measurement is the best estimate of the area in square feet of the backyard that she wants to cover with grass, which does not include the area of the patio?

The net rectangular prism and its dimensions are shown below in the diagram.  Find the total surface area of this figure. 

Use the ruler provided to measure the radius of the circle to the nearest inch.

Which measurement is closest to the area of the circle in square inches?

The circumference of a circle is C inches. The diameter of the circle is 16 inches. McKenzie says you can represent the value of π by dividing 8 by C. Paige says you can represent the value of π by dividing C by 16. 

Who is correct and why?

• McKenzie is correct because pi is the ratio of the radius of a circle to the circumference.

• Paige is correct because pi is the ratio of a radius of a circle to its diameter.

• Paige is correct because pi is the ratio of circumference of its circle to its diameter.

• McKenzie is correct because pi is the ratio of the radius of a circle to the circumference.

What is the volume of the triangular prism?