P=2 (w+h) h the subject
P=2(w+h)remember you can do anythig to an equaotn as lng as you do it to both sidesdivide both sides by 2P/2=w+hsubtract w(P/2)-w=h
P=2(w+h)P=2w+2hP-2w=2h(P-2w)/2 = hor h=(P-2w)/2