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Pelajaran :MatematikaKelas :8
Bab :8
Nama Bab :Bangun Ruang
Kode mapel:2
Kode :8.2.8
Jawab:
a)
V=1/3La×t
1.280cm³=1/3La×15cm
5cm La=1.280cm³
La=1.280cm³/5cm
La=256cm²
b)
s=√La
=√(256cm²)
=16cm
c)
TP=√(15cm)²+(16cm/2)²
=√225cm²+(8cm)²
=√225cm²+64cm²
=√289cm²
=17cm
d)
LP=La+4 L segitiga
=256cm²+4(16cm×17cm/2)
=256cm²+2(272cm²)
=256cm²+544cm²
=800cm²