What is the formula to find area of a shape?

Depends on what shape you're looking to find the area of.

Area of a rectangle = Length x Width x Height

(same for parallelogram)

Area of a triangle = 1/2 Base x Height or S^2 times root four divided by three

Circumference of a circle = 22/7 (of 3.14) x the diameter of the circle. A Square or Rectangle: Multiply the length of the rectangle by the width of the rectangle or the opposite. A Triangle: Multiply the the Base length (from the bottom of triangle to the tip on top) by the Width of the triangle. Then, divide your results in half. A Circle: Multiply the radius by radius by 3.14 (pi) to find answer.