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4500 = luas alas . 30
luas alas = 150 cm²
luas alas = 1/2 alas . t
150 = 1/2 15 . t
300 = 15 t
t = 20 cm
luas permukaan = 2 luas alas + 3 sisi
= 2 . 150 + 15 . 30 + 20 . 30 + 25 . 30
= 2100 cm²
2). volume prisma = luas alas x tinggi
5625 = 9x² . 5x
5625 = 45x³
x³ = 125
x = 5cm
panjang sisi alas = 3x = 3 . 5 = 15cm
3). d1 = 3/2 . 6 = 9cm
d2 = 3/2 . 12 = 18cm
tinggi = 3/2 . 16 = 24 cm
volume = luas alas x tinggi
= (9.18)/2 . 24
= 1944 cm³