Question

Find the length of the third side. If necessary, round to the nearest tenth.
4

Answer 1

2.65

Explanation:

take the length of the third side as x

so,take Pythagoras theorem

4^2=3^2+x^2

16=9+x^2

x^2=16-9

x^2=7

x=√7

x=2.645

x=2.65

Answer 2

x=2.6

Explanation:

We can use the Pythagorean theorem to find the third side

a^2 + b^2 = c^2 where a and b are the legs and c is the hypotenuse

3^2 + x^2 = 4^2 where x is the unknown side

9 + x^2 = 16

Subtract 9 from each side

x^2 = 16-9

x^2 = 7

Take the square root of each side

sqrt(x^2) = sqrt(7)

x =2.645751311

Rounding to the nearest tenth

x = 2.6