7th Grade IM End of Unit 3 Assessment: Measuring Circles

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

How do you calculate the circumference of a circle?

Back

Circumference = 2 × π × r or Circumference = π × d, where d is the diameter.

Front

If a circle has a radius of 50 cm, what is its area?

Back

Area = π × (50 cm)² ≈ 7,854 cm².

Front

What is the diameter of a circle if the radius is 20 cm?

Back

Diameter = 2 × radius = 2 × 20 cm = 40 cm.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius.

Front

How do you find the radius if you know the area of a circle?

Back

Radius = √(Area/π).

Front

What is the perimeter of a circle also known as?

Back

The perimeter of a circle is known as the circumference.

Front

If a circular field has a diameter of 290 feet, what is its radius?

Back

Radius = Diameter/2 = 290 feet/2 = 145 feet.

Front

How many square feet are in a circular field with a radius of 145 feet?

Back

Area = π × (145 feet)² ≈ 66,052 square feet.