alas prisma berbentuk belah ketupat dgn panjang diagonal 18 dan 24 cm.bila tinggi prisma 20 cm,maka luas seluruh sisi prisma adalah.....

Panjang sisi belah ketupat
s² = (18/2)² + (24/2)²
s² = 225
s = 15

Lp prisma = 2 luas alas + k alas * t prisma
= 2 * 1/2 * 18 * 24 + 15(4) * 20
= 432 + 1200
= 1632 cm²

d1 = 18 cm
d2 = 24 cm
t = 20 cm

s^2 = (1/2d1)^2 + (1/2d2)^2
s^2 = (1/2×18)^2 + (1/2×24)^2
s^2 = 9^2 + 12^2
s^2 = 81 + 144
s^2 = 225
s = V225
s = 15 cm

L seluruh sisi prisma
= (2×La) + (4×Lsisi tegak)
= (2×1/2×d1×d2) + (4×s×t)
= (2×1/2×18×24) + (4×15×20)
= 432 + 1200
= 1632 cm^2