Area, Perimeter, and Circumference

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where C is the circumference and r is the radius.

Front

What is the formula for the area of a circle?

Back

A = πr², where A is the area and r is the radius.

Front

What is the formula for the perimeter of a rectangle?

Back

P = 2(l + w), where P is the perimeter, l is the length, and w is the width.

Front

What is the formula for the area of a rectangle?

Back

A = l × w, where A is the area, l is the length, and w is the width.

Front

What is the formula for the area of a triangle?

Back

A = 1/2(bh), where A is the area, b is the base, and h is the height.

Front

What is the difference between area and perimeter?

Back

Area measures the space inside a shape, while perimeter measures the distance around a shape.

Front

How do you convert diameter to radius?

Back

Radius is half of the diameter (r = d/2).

Front

What is the relationship between circumference and diameter?

Back

Circumference is π times the diameter (C = πd).

Front

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

Back

A = π(5)² = 25π ≈ 78.5 cm².

Front

If a rectangle has a length of 10 m and a width of 4 m, what is its area?

Back

A = 10 m × 4 m = 40 m².