Question 784604
a^2+b^2=c^2 Where a and b are the legs of the triangle and c is the hypoteneuse:

24^2+18^2=c^2

576+324=c^2

900=c^2

Square root both sides: 300=c

Also note that this triangle: 24,18,30 is called a Pythagorean Triple. It is a fairly common one!

Hope this helps!