A right triangle has legs with lengths of 5 cm and 12 cm. Find the length of the hypotenuse ... A ... 7 cm. B ... 13 cm. C ... 17 cm. D ... 34 cm

This can be solved using the pythagorean theorem. The theorem is shown below:

c^2 = a^2 + b^2

The hypotenuse is c, so substituting the given values:

c^2 = (5) ^2 + 12^2

c^2 = 25 + 144

c = sqrt (169)

c = 13

Therefore, the correct answer is B. 13 cm.