Question

A, B & C form a triangle where ∠BAC = 90°.
AB = 3.3 mm and CA = 7.7 mm.
Find the length of BC, giving your answer rounded to 1 DP.

Answer 1

Answer:

8.37

=8.4

Step-by-step explanation:

by Pythagoras theorem

(hypotenuse)² = (height)² + (base) ²

BC² = AB² + AC²

= (3.3)² + (7.7)²

= 10.89+59.23

BC² = 70.2

BC =√70.2

= 8.37

= 8.4