Question

Please help solve this question!

Answer 1

Answer:

$\sqrt{49 - x^{2}}$

Step-by-step explanation:

Pythagorean theorem  $c^{2} = a^{2} + b^{2}$ Then:

$7^{2} = x^{2} + y^{2}\\y^{2} = 7^{2} - x^{2}\\y^{2} = 49 - x^{2}\\y = \sqrt{49 - x^{2}}$

the lenght of the third side = $\sqrt{49 - x^{2}}$

Ф = $sin^{-1} (\frac{x}{7} )$

Ф = $cos^{-1} (\frac{y}{7} )$

Ф = $tan^{-1} (\frac{x}{y} )$