Question

Find the missing side round your answer to the nearest tenth

Answer 1

x ≈ 14.7

Explanation:

Assuming the triangle is right then use Pythagoras' identity.

The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is

x² + 15² = 21²

x² + 225 = 441 ( subtract 225 from both sides )

x² = 216 ( take the square root of both sides )

x =
`√(216)` ≈ 14.7 ( to the nearest tenth )