Question

Prisma tegak segitiga PQRSTU,jika PR=SU=20 cm,PQ=12 cm,QT=30 cm,dan QR=16 cm,tentukan volume prisma PQRSTU

Answer 1

V=LA * t prisma
LA=√[l(l-PQ)(l-QR)(L-PU)]
l = 1/2 (PQ+QR+PU)= 1/2(12+16+20) = 24
LA= √[24(24-12)(24-16)(24-20) =√[24(12)(8)(4)=√[24(384)] = √(9216)=96 cm²
V = 96cm² × 30cm = 2880cm³