First learn about Squares, then Square Roots are easy. ... Squared is often written as a little 2 like this ... This says 4 Squared equals 16 (the little 2 says the number appears| www.mathsisfun.com
Make a 3,4,5 Triangle ... Connect three lines ... And you will have a right angle (90) ... You can use other lengths by multiplying each side by 2. Or by 10. Or any multiple.| www.mathsisfun.com
A right-angled triangle (also called a right triangle)is a triangle with a right angle (90) in it. ... The right angled triangle is one of the most useful shapes in all of| www.mathsisfun.com
Algebra| www.mathsisfun.com