Question

A, B & C form a triangle where

∠
BAC = 90°.
AB = 8.4 mm and CA = 7 mm.
Find the length of BC, giving your answer rounded to 1 DP.

Answer 1

10.9

Explanation:

Pythagoras theorem- a² + b² = c²

Since this is a right angle with each side on the right angle's length given you can use pythagoras theorem.

7² + 8.44² = c²

= 49 + 70.56 = c²

= 119.56 = c²

∴ c = √119.56

= 10.9