Area of shapes

Front

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

Back

Area = π × r², where r is the radius.

Front

If the radius of a circle is 4 feet, what is the area?

Back

50.24 square feet (using π = 3.14).

Front

What is the area of a rectangle with a length of 10 yards and a width of 4 yards?

Back

Area = length × width = 10 yd × 4 yd = 40 yd².

Front

What is the area of a square with a side length of 5 cm?

Back

Area = side × side = 5 cm × 5 cm = 25 cm².

Front

How do you find the area of a triangle?

Back

Area = 1/2 × base × height.

Front

What is the area of a triangle with a base of 8 m and a height of 5 m?

Back

Area = 1/2 × 8 m × 5 m = 20 m².

Front

What is the difference between radius and diameter?

Back

Radius is half the diameter; Diameter = 2 × radius.

Front

If the diameter of a circle is 10 cm, what is the radius?

Back

Radius = diameter / 2 = 10 cm / 2 = 5 cm.

Front

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

Back

Area = π × (3 cm)² = 28.26 cm² (using π = 3.14).

Front

What is the area of a shaded region if the total area is 120 m² and the unshaded area is 14 m²?

Back

Area of shaded region = Total area - Unshaded area = 120 m² - 14 m² = 106 m².