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⇒Tentukan luas alas :
↬La = s × s
↬La = 20 × 20
↬La = 400 cm²
⇒Tentukan luas segitiga :
⇎alas = OB
⇎OB = ½ AB
⇎OB = ½ × 20
⇎alas = OB = 10 cm
⇎tinggi segitiga :
= √ OT² + OB²
= √ 24² + 10²
= √ 576 + 100
= √ 676
= 26 cm
⇎maka, luas segitiga tersebut :
↬L = ½ × a × t
↬L = ½ × 20 × 26
↬L = 10 × 26
↬L = 260 cm²
⇒maka, luas prisma tersebut :
↬Luas prisma = La + 4 ( Luas segitiga )
↬L = 400 + 4 ( 260 )
↬L = 400 + 1040
↬L = 1440 cm² [ opsi. C ]