a : aV3 : 2a
1/2 : 1/2 V3 : 1
L = (a + b) x t
__________
2
= (1 + 1 +V3) x 1/2
_________
2
= (2 + V3)
_______ x 1/2
2
L = 2 + V3 satuan luas
______
4
L = 2/4 + 1/4V3
L = 1/2 + 1/4V3 satuan luas