Bantu no 30 Beserta caranya

4Sisi=  72
S= 18
T² = Tp² – (1/2S)²
T² = 15² – 9² = 225-81= 144
T = √144= 12

V= 1/3 .Luas alas x Tinggi
   = 1/3 x 18² x 12
   = 1.296

Volume limas = 1/3 × luas alas × tinggi
= 1/3 × (72:4)^2 × t
= 1/3 × 18 × 18 × t
= 108t

t^2 = 15^2 – 9^2
t = 12 (triple phytagoras)

V= 108t
V= 108 × 12
V = 1.296 cm^3
jawabannya D