Area of Rectangles, Triangles and Circles

Front

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

Back

Area = length × width

Front

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

Back

Area = 1/2 × base × height

Front

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

Back

Area = πr², where r is the radius of the circle

Front

If the diameter of a circle is 30 feet, what is the radius?

Back

Radius = diameter / 2 = 15 feet

Front

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

Back

Area = 10 cm × 4 cm = 40 cm²

Front

What does the term 'area' refer to in geometry?

Back

Area refers to the amount of space inside a shape.

Front

How do you convert the diameter of a circle to its radius?

Back

Divide the diameter by 2.

Front

What is the area of a triangle with a base of 10 ft and a height of 12 ft?

Back

Area = 1/2 × 10 ft × 12 ft = 60 ft²

Front

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

Back

Area = π(5 cm)² ≈ 78.54 cm²

Front

What is the area of a rectangle with an area of 80 cm² and a width of 8 cm?

Back

Length = Area / Width = 80 cm² / 8 cm = 10 cm