Unit 3 Review

Front

What is the formula to calculate the circumference of a circle?

Back

C = 2πr, where r is the radius of the circle.

Front

If a DVD has a diameter of 15 millimeters, what is its radius?

Back

The radius is half of the diameter, so the radius is 7.5 millimeters.

Front

What does it mean for two quantities to be proportional?

Back

Two quantities are proportional if they increase or decrease at the same rate.

Front

How do you find the circumference of a circle using its diameter?

Back

Use the formula C = πd, where d is the diameter.

Front

What is the circumference of a circle with a diameter of 15 millimeters?

Back

C = π × 15 ≈ 47.12 millimeters.

Front

What is a proportional relationship in a graph?

Back

A proportional relationship in a graph is a straight line that passes through the origin.

Front

If a pool is filled at a constant rate, how can you represent the amount of water over time?

Back

You can represent it with a linear equation, such as y = mx, where m is the rate of filling.

Front

What is the unit of measurement for volume in gallons?

Back

Gallons are a unit of volume commonly used in the United States.

Front

If a pool has 380 gallons of water after 25 minutes, what can you infer about the filling rate?

Back

The filling rate is consistent, indicating a proportional relationship between time and volume.

Front

What is the relationship between time and volume in a proportional graph?

Back

As time increases, the volume also increases at a constant rate.