Unit 9 Assessment

What is the relationship between the diameter and the radius of a circle?

• A. The diameter is one-half the length of the radius.

• B. The diameter is twice the length of the radius.

• C. The diameter is the square of the radius.

• D. The diameter is equal to the radius.

The circumference of a circle is about 19 centimeters. Which statement is true about the diameter?

• A. The diameter is approximately 19 centimeters.

• B. The diameter is approximately 6 centimeters.

• C. The diameter is approximately 3 centimeters.

• D. The diameter is approximately 1 centimeter.

Marcus is exploring the relationship between a circle’s radius and its circumference. Which table should Marcus choose to correctly demonstrate this relationship?

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Which is NOT an approximation for pi (π)?

• B. 3.14

Lou measured the circumference of a circular trash can as 37.7 inches with a diameter of 12 inches. Which expression gives an approximate value of pi (π)?

The radius of a pizza is 6 inches. How could you find the circumference of the pizza?

• A. Multiply the radius by 2 and by π

• B. Find the square of the radius

• C. Find the square of the radius and multiply by π

• D. Divide the radius by 2 and multiply by π

A pizza company is advertising an 18 inch pizza that costs $13.99. Which is closest to the area of the pizza?

• 28.26 sq in.

• 56.52 sq in.

• 81 sq in.

• 254.34 sq in.

The diameter of each wheel on a bicycle is 22 inches. Which is closest to the circumference of one wheel?

• 34.56 inches

• 69.11 inches

• 138.23 inches

• 380.13 inches

Consider a triangle and a parallelogram with the same base and same height. Which statement is true?

• The area of the triangle is always greater than the area of a parallelogram with the same base and same height.

• The area of the triangle is always twice the area of a parallelogram with the same base and same height.

• The area of the triangle is always half the area of a parallelogram with the same base and same height.

• The area of the triangle is always equal to the area of a parallelogram with the same base and same height.

Ben is laying a triangular brick patio beside his wood deck. What is the area of the brick patio?

• 60 ft²

• 120 ft²

• 125 ft²

• 250 ft²