Question

A, B & C form a triangle where ∠ BAC = 90°. AB = 0.4 mm and CA = 1 mm. Find the length of BC, giving your answer rounded to 1 DP.

Answer 1

Answer:

$ab ^{2} + ca {}^{2} = bc {}^{2} \\ \sqrt{0.4 \times 0.4 + 1 \times 1} = bc \\ 0.16 + 1 = bc \\ bc = 1.16 \: \: \: \: answer$