area

what is the formula for finding the area of a circle?

what is the formula for the area of a triangle?

if the height of a triangle is 12 cm and the base length is 1 m then what is it's area?

If the diameter of a circle is 9 cm, then what is the area? (3 s.f)

What is the formula for
calculating the area of a
trapezium ?

what is the area of a trapezium whose parallel sides are 38.7 cm and 22.3 cm, and the distance between them is 16 cm?

The parallel sides of a trapezium are 25 cm and 11 cm, while its non parallel sides are 15 cm and 13 cm. Find the area of the trapezium.

What is the area of a sphere?

what is the area of a hemisphere with the radius of 10cm? (in terms of pi)