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d2 = x + 14
Volume prisma = luas alas x TP
1800 = lluas alas x 15
luas alas = 1800/15
= 120
luas alas = ( d1 x d2) / 2
120 = x ( x + 14) /2
120 x 2 = x² + 14x
240 = x² + 14x
x² + 14x - 240
akat-akarnya
x1 = -24
x2 = 10 ---> ambil nilai positif
jadi
di = x = 10
d2 = x + 14 = 10 + 14 = 24
panjang sisi belah ketupat =
= √169
= 13
luas permukaan prisma =( 2 x lluas alas) + ( keliling x TP)
= ( 2 x 120 ) + ( 4 x 13 x 15)
= 240 + 780
= 1020