Right triangle abc has side lengths 15 cm and 20 cm. what is the length of the hypotenuse?

Pythagoras Theorem:
 
a² + b² = c²


Find hypotenuse:

15² + 20²  = c²
c² = 15² + 20²
c² = 225 + 400
c² = 625
c = √625
c =25


The length of the hypotenuse is 25 cm.

By Pythagoras theorem
let h be the length of hypotenuse
15^2+20^2=h^2
h^2=625
h=25

You can find the area of a rectangle by multiplying the length and height. so multiply 1/2*7/4(which is the simpler version of 1 3/4) and you get 7/8 as your answer.