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ingat pitagoras
V = luas alas * t
luas alas = 1/2 *12 * 9
V = luas alas * tinggi
dimasukkan angkanya
tandai jawaban terbaik ya :D
2
s = 15+12+9
2
s = 36/2 = 18
L.alas^2 = s (s-a)(s-b)(s-c)
= 18 (18-15)(18-12)(18-9)
= 18 (3)(6)(9)
= 18 (162)
= 2916
sehingga L.alas = akar 2916 = 54
Volume prisma = L.alas x tinggi = 54 x 2 = 108 dm^3