Area of Parallelograms, Triangles and Circles

Front

What is the formula for the area of a circle?

Back

The area of a circle is calculated using the formula A = πr², where A is the area and r is the radius.

Front

How do you calculate the area of a triangle?

Back

The area of a triangle is calculated using the formula A = 1/2 * base * height.

Front

What is the formula for the area of a parallelogram?

Back

The area of a parallelogram is calculated using the formula A = base * height.

Front

What is the value of π (pi) to two decimal places?

Back

π (pi) is approximately 3.14.

Front

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

Back

To find the radius from the area, use the formula r = √(A/π), where A is the area.

Front

What is the area of a circle with a radius of 10 cm?

Back

The area is A = π(10)² = 314.16 cm².

Front

What is the relationship between the diameter and radius of a circle?

Back

The diameter is twice the radius, d = 2r.

Front

How do you convert square feet to square meters?

Back

To convert square feet to square meters, multiply by 0.092903.

Front

What is the area of a triangle with a base of 5 cm and a height of 10 cm?

Back

The area is A = 1/2 * 5 * 10 = 25 cm².

Front

What is the area of a parallelogram with a base of 6 cm and a height of 4 cm?

Back

The area is A = base * height = 6 * 4 = 24 cm².