Problem
(4) Which set of side lengths could form a right triangle? (A) \( 1 \mathrm{~cm}, 3 \mathrm{~cm}, 2 \mathrm{~cm} \) (B) \( 10 \mathrm{~cm}, 6 \mathrm{~cm}, 8 \mathrm{~cm} \) (C) \( 5 \mathrm{~cm}, 10 \mathrm{~cm}, 15 \mathrm{~cm} \) (D) \( 7 \mathrm{~cm}, 7 \mathrm{~cm}, 7 \mathrm{~cm} \)
Solution
Step 1 ：\( 10^2 = 100 \)
Step 2 ：\( 6^2 + 8^2 = 36 + 64 = 100 \)
Step 3 ：\( 10^2 = 6^2 + 8^2 \)
