7th grade IQ test

Front

What is the formula for the circumference of a circle?

Back

The formula for the circumference (C) of a circle is C = d × π, where d is the diameter of the circle.

Front

How do you calculate the area of a circle?

Back

The area (A) of a circle is calculated using the formula A = π × r², where r is the radius of the circle.

Front

What is the value of π (pi) approximately?

Back

The value of π (pi) is approximately 3.14.

Front

If the radius of a circle is 12, what is the area?

Back

The area is approximately 452.39 square units.

Front

What is the circumference of a circle with a diameter of 8?

Back

The circumference is approximately 25.12 units.

Front

What does 'r' represent in the formulas for circumference and area of a circle?

Back

'r' represents the radius of the circle.

Front

What does 'd' represent in the formulas for circumference and area of a circle?

Back

'd' represents the diameter of the circle.

Front

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

Back

The diameter (d) is twice the radius (r), so d = 2 × r.

Front

What is the relationship between diameter and circumference?

Back

The circumference is directly proportional to the diameter, expressed as C = π × d.

Front

What is the area of a circle with a radius of 5?

Back

The area is approximately 78.54 square units.