yg ditandai aja jwbnya .. pake cara sekalian ..hehhebe

2.x kuadrat=21^2+20^2
x^2=441+400
x^2=841
x=29
3.x^2=12^2-8^2
x^2=144-64
x^2=80
4.x^2=13^2-10^2
x^2=169-100
x^2=69