Area and Perimeter

Front

What is the formula for the area of a circle?

Back

A = πr², where r is the radius of the circle.

Front

What is the formula for the perimeter of a rectangle?

Back

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

Front

What do you need to calculate to find the distance around a shape?

Back

You need to calculate the perimeter.

Front

What is the formula for the area of a rectangle?

Back

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

Front

What is the formula for the area of a triangle?

Back

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

Front

If a rectangle has a length of 10 cm and a width of 5 cm, what is its area?

Back

50 cm².

Front

If a triangle has a base of 8 cm and a height of 5 cm, what is its area?

Back

20 cm².

Front

What is the perimeter of a square with a side length of 4 cm?

Back

16 cm.

Front

How do you find the area of a circle with a radius of 3 cm?

Back

A = π(3)² = 28.27 cm² (approximately).

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.