Question

A, B & C form a triangle where ∠ BAC = 90°. AB = 10.8 mm and CA = 1.6 mm. Find the length of BC, giving your answer rounded to 1 DP.

Answer 1

Answer:

find the DP by the Pythagoras theorem

Answer 2

Answer:

10.9

Step-by-step explanation:

$ab^{2} + ac^{2} = bc^{2}\\10.8^2 + 1.6^2 + bc^2\\116.64 + 2.56 = 114.2 \\\sqrt{114.2} = 10.9178752512\\to 1DP = 10.9$

Hope this helps people :)