tolong dijawab please

K = 4 × s
72 = 4 × s
s = 72 ÷ 4
s = 18 cm

t Limas = √( 15² - (½ • 18 )² )
= √(225 - 81)
= √144
= 12 cm

V = ⅓ × s × s × t
= ⅓ × 18 × 18 × 12
= 1.296 cm³ ( D )