Question

Can someone please help me with answering this

Answer 1

? = 1 (assuming right-angled triangle)

Explanation:

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

`a^(2) = c^(2) - b^(2)`

`√(10)^(2)` is, of course, 10, so 10 - 9 = 1, and
`√(1) = 1`.