A regular pyramid has a square base with edge length and height . What is the total surface area of the four triangular lateral faces?
Answer and explanation
Correct answer: B.
- Step 1: Distance from base center to an edge midpoint is . The slant height of each lateral face is . Each triangular face has area . Four lateral faces total . **Answer: . Why not the others:** uses the vertical height (), adds the base area, and is half of the lateral area.
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