1. Warm Up Problem
Evaluate the expression.
2(3 + 4) + 20 – 8² ÷2 =

2. Surface Area of Triangular Prisms
Lesson 10-4

3. Objectives I can find the surface area of triangular prisms.
I can define surface area.

5. Example 1
Find the surface area of the triangular prism. Find the area of each face and add: Triangle (x2) 1 x 0.8 = 0.8 ÷ 2 = x 2 = 0.8 Rectangle (x3) 2 x 1 = 2 2 x 3 = 6 Sum: = 6.8cm²

6. Got It?
1. Find the surface area of the triangular prism.

7. Example 2
Find the surface area. Break it down into its basic shapes: Find the sum: = 920m²

8. Got It?
Find the surface area of each triangular prism

9. Example 3 A bakery boxes pie pieces in a
triangular prism box, as shown. Find the amount of cardboard used to make a box for a slice of pie.
Add up the areas:
=116in²

10. Got It?
4. A kaleidoscope is made of stained glass in the shape of a triangular prism. The bases are equilateral triangles. Find the surface area of the kaleidoscope.