Question

Please answer correctly !!!!! Will mark Brianliest !!!!!!!!!!!!!!

Answer 1

`√(143)`

Explanation:

Use pythagorean theorem to find the missing side.

`a^2+b^2=c^2`

`1^2+b^2=12^2\\1+b^2=144\\b^2=143\\b=√(143)`

This can not be simplified any further.

The third side in simpliest radical form is
`√(143)`.