Question

Why is it not possible to form a right triangle with the lengths 2, 4 and 7?

A. Because 4² – 2² ≠ 7²
B. Because 2 + 4 ≠ 7
C. Because 2² + 4² ≠ 7²
D. Because 2² + 7² ≠ 4²

Answer 1

Pythagorean Theorem

a^2 + b^2 = c^2

2^2 + 4^2 = 7^2?

This is not true, so the answer is C. Because 2² + 4² ≠ 7².

Let me know if this helps!