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40÷2 = 20
akar 25 kuadrat - 20 kuadrat = 15
panjang diagonal lainnya = 15.2 = 30
B. 1/2. 30.40 . 18.1/3
= 600 . 6
= 3600 cm3
100 = 2.40 + 2.d2
100 = 80 + 2.d2
- 2.d2 = 80 - 100
-2.d2 = -20
d2 = -20 : -2 = 10 cm
a. panjang diagonal lain = 10 cm
b. V.limas = 1/3 x La x t
= 1/3 x (d1 x d2/2) x 18
= 6 (40 x 10/2)
= 6 x 200
= 1200 cm^3