Area review

Front

What is the formula for the area of a circle?

Back

The area of a circle is given by the formula: A = πr², where r is the radius.

Front

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

Back

To find the radius, use the formula: r = √(A/π).

Front

What is the area of a circle with a radius of 7?

Back

The area is A = π(7)² = 49π.

Front

What is the area of a circle with a radius of 6?

Back

The area is A = π(6)² = 36π.

Front

What is the area of a circle with a radius of 3?

Back

The area is A = π(3)² = 9π.

Front

What is the formula for the area of a rectangle?

Back

The area of a rectangle is given by the formula: A = length × width.

Front

What is the area of a rectangle with a length of 5 cm and a width of 8 cm?

Back

The area is A = 5 cm × 8 cm = 40 square cm.

Front

What is the definition of arc length in a circle?

Back

Arc length is the distance along the edge of a circle between two points.

Front

What is the formula for finding the area of a sector of a circle?

Back

The area of a sector is given by the formula: A = (θ/360) × πr², where θ is the central angle in degrees.

Front

If the radius of a circle is 10 inches, what is the area of a sector with a central angle of 90°?

Back

The area of the sector is A = (90/360) × π(10)² = 25π.