find the length of the hypotenuse of a right triangle, the other tow sides of which measure 9 cm and 12 cm.

2 answers

anglec=45¡ã
Use the Pythagorean theorem, which states a^2 + b^2 = c^2, where c is the hypotenuse. sqrt(9^2 + 12^2) =sqrt(81+144) = sqrt(225) = 15
Then it is 15cm.
Btw, what do you mean with anglec=45?
The sum of the inner angles in a triangle is 180, and if it is right, then 1 angle is 90. Therefore the sum of the remaining angles has to be 90, and if one is 45, also the other one has to be 45, but if that the case, the triangle is isosceles.