← Back to Test

Problem 4 - Olympiad

A regular tetrahedron has edge length 4 cm. What is its total surface area?

A. 16√3 cm²B. 4√3 cm²C. 48√3 cm²D. 12√3 cm²

Correct: A

A regular tetrahedron has 4 equilateral triangular faces. Area of one face = (√3/4)(edge)² = (√3/4)(16) = 4√3 cm². Total = 4 × 4√3 = 16√3 cm².