Question

Can someone please help me with answering this

Answer 1

Answer:

? = 1 (assuming right-angled triangle)

Step-by-step explanation:

This is an application of Pythagoras' Theorem, but rearranged:

$a^{2} = c^{2} - b^{2}$

$\sqrt{10}^{2}$ is, of course, 10, so 10 - 9 = 1, and $\sqrt{1} = 1$.