Question

Math question on picture

Answer 1

the unknown side is 28

Explanation:

`a^(2) + b^(2) = c^(2) \\c = 35\\a = 21\\21^(2) + b^(2) = 35^(2)\\441 + b^(2) = 1225\\b^(2) = 1225 - 441\\b^(2) = 784\\b = √(784) \\b = 28`

Answer 2

28 cm

Explanation:

let the unknown side be x , then

using Pythagoras' identity in the right triangle

x² + 21² = 35²

x² + 441 = 1225 ( subtract 441 from both sides )

x² = 784 ( take square root of both sides )

x =
`√(784)` = 28