First find the area of the top triangle. Multiply that by 2. Then, find the the area of one of the side triangles. Multiply that by 3. Add both numbers and remember to but a 2 on the upper left of the total.
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It depends on the size of the triangular prism, but depending on the side of the prism you use the triangle area formula to find it or the rectangle area formula to find it.
The base of a rectangular prism is a rectangle. The area of a rectangle is length times width.
The cross-section of a prism is the same - it is the same as the shape of the two parallel "bases"; this cross-section can be any shape, not necessarily a rectangle. Each side of a prism is rectangular, so knowing the formula for a rectangle will help you along to finding the surface area of the prism by helping you to calculate the area of the sides; however, you will still need to be able to calculate the area of the bases (unless it is given to you), for which knowing the area of a rectangle may not (usually will not) help.
Volume of a rectangular prism= LengthXWidthXHeight Area of a Rectangle= LengthXWidth Area of a Trapezoid= (Bottom+Top)/2)XHeight
If the base is a rectangle, use the formula for the area of a rectangle.