Question

A, B & C form a triangle where Z BAC = 90°.

AB = 7.3 mm and CA = 4.6 mm.
Find the length of BC, giving your answer rounded to 1 DP.

Answer 1

BC ≈ 8.6

Explanation:

Using Pythagoras' identity in the right triangle , that is

BC² = AB² + AC² = 7.3² + 4.6² = 53.29 + 21.16 = 74.45 ( square root both sides )

BC =
`√(74.45)` ≈ 8.6 ( to 1 dec. place )