Question

Help me please with this question

Answer 1

`y = \sqrt{ \frac{\pi \: x - A {}^{} }{\pi} }`

Explanation:

To make y subject of formular, we place y in terms of other variables.

`A = \pi \: x {}^(2) - \pi \: y {}^(2) \\ making \: y \: subject \\ A + \pi \: y {}^(2) = \pi \: x {}^(2) \\ \pi \: y {}^(2) = \pi \: x {}^(2) - A \\ Dividing \: bothsides \: by \: \pi \\ y {}^(2) = \frac{\pi \: x { - A}^{} }{\pi} \\ Squarerooting \: bothsides \\ y = \sqrt{ \frac{\pi \: x - A {}^{} }{\pi} }`