2.5

Psquare

4s

Prectangle

2w + 2l

Ptriangle

a + b + c

Ccircle

2?r

Asquare

s�

Arectangle

l(w)

Atriangle

bh/2

Atrapezoid

h(b1 + b2)/2

Acircle

?r�

Vcube

s�

Vrectangle

l(w)h

Vcircle

?(r�)h

Vsphere

4/3?r�

Vcone

?(r�)h/3