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72= 4s
s= 72/4= 18 cm
ukuran utk sisi tegak 9, 12, 15
Luas permukaan= La + 4 L sisi tegak
= 18.18 + 4.1/2.18.15
= 324 + 540 = 864 cm persegi
72 = 4S
S = 18
2. LUAS ALAS = 18 × 18 = 324
3. OT = 12
BC = 18 ÷ 2 = 5
TE = OT² + BC²
= 12² +9²
= 144 + 81
= √225
= 15
LUAS Δ = 1/2 × BC × TE
= 1/2 × 10 × 13
= 75
LUAS SELIMUT = 4 × 75
= 300
4. LUAS PERMUKAAN = 300 + 324
= 624