- 3d Figures and Volumes
- Home
- Classifying Solids
- Vertices, Edges, and Faces of a Solid
- Volume of a Rectangular Prism
- Volume of a Rectangular Prism made of Unit Cubes
- Volume of a Solid made of Cubes with Unit Fraction Edge Lengths
- Volume of a Rectangular Prism with Fractional Edge Lengths
- Word Problem Involving the Volume of a Rectangular Prism
- Word Problem Involving the Rate of Filling or Emptying a Rectangular Prism
- Volume of a Triangular Prism
- Word Problem Involving the Volume of a Triangular Prism

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In this lesson we find the volume of a triangular prism

A triangular prism is a prism that has two congruent parallel triangles as its bases and rectangular lateral faces.

**Formula for the volume of a triangular prism**

If A is the area of the base triangle and h is the height of the prism then volume of the prism is given by

Volume V = A × h

Where A = $\frac{1}{2}$ b h or $\sqrt{s(s-a)(s-b)(s-c)}$ or $a^2 \sqrt{3}/ 4$

b is the base of the triangle and h is the height

a, b, and c are the sides of the triangle and s =(a+b+c)/2

a is the side of an equilateral triangle

Find the volume of the following triangular prism.

**Step 1:**

Volume of a triangular prism = Areas of base triangle × height of prism

**Step 2:**

Volume of given prism V = $\frac{1}{2}$ × 14 × 8 × 10

= 560 cubic feet

Find the volume of the following triangular prism.

**Step 1:**

Volume of a triangular prism = Areas of base triangle × height of prism

**Step 2:**

Volume of given prism V = $\frac{1}{2}$ × 14 × 8 × 6

= 336 cubic ft

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