This is Pythagorean Theorem... one of the sides is 5 and the other is 3. Using the Pythagorean theorem (a^2 +b^2=c^2) you can plug in the given numbers and your equation should be 5^2+3^2=c^2. 5x5= 25 and 3x3= 9 so you should now have 25+9 which equals 34. Since 34= c^2, you have to find the square root of 34 on your calculator and that equals about 5.8. Hope this helps!
