- 1). Determine the base area of a triangular-based prism. The base or floor of a triangular based prism is a triangle, so you can apply the formula for measuring the area of a triangle to find the base area of the prism. Calculate the base and height of the triangle that forms the base of the prism. Apply the formula "1/2 x base x height" to calculate the base area of the triangular based prism.
- 2). Determine the base area of a rectangular-based prism. The floor of a rectangular based prism is a rectangle, which has a length and a width. Calculate the length and width of the rectangle and use the formula "Length x Width" to determine the base area.
- 3). Calculate the base area of a circular based prism. The base of a circular based prism is a circle. Calculate the radius of the circle and use the formula "3.14 x (Radius)^2", where 3.14 is the value of the 'pi'.
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