Length of a triangle

Question

 Determine the length of the third side of the right triangle. Write the answer as a simplified radical.

 

9in

3in

?

 

The length of the third side is____ in.

Answer 1

I'm going to assume the third side is the hypotenuse, since you didn't tell us that in  your question.

a² + b² = c²

9² + 3² = c²

81 + 9 = c²

90 = c²

√90 = √c

√9√10 = c

3√10 inches = c