GCSE Maths Practice: surface-area

Question 5 of 10

This question introduces surface area of a triangular prism.

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\( \begin{array}{l}\text{Find the surface area of a triangular prism with base } 3\,\text{cm}, height 4\,\text{cm}, length 10\,\text{cm}.\end{array} \)

Choose one option:

Compute triangles first, rectangles next, sum all. Check units (cm²).

A triangular prism has two triangular bases and three rectangular sides. Calculate area of one triangle: 1/2 × base × height. Multiply by 2 for both triangles. Then find area of three rectangles: length × side of triangle. Sum triangle and rectangle areas for total surface area. Example: triangle base 3 cm, height 4 cm, length 10 cm → triangle areas 2×6 = 12 cm², rectangles (3+4+5)×10=120 cm², total SA = 12+120=144 cm². Practice identifying all faces and computing separately.