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Verified answer
No. 5AB = 16
BD = 8
DE = 6
BC = ?
maka
AB/AD = BC/DE
16/(AB - BD) = BC/6
16/(16-8) = BC/6
16/8 = BC/6
2 = BC/6
BC = 12
No. 6
AB = 30
CD = 20
CF : BF = 2 : 3
CF = (2/3)BF
maka
AB/BC = EF/CF
30/(BF+CF) = EF/CF
30/(3/2CF + CF) = EF/CF
30/(5/2 CF) = EF/CF
30CF = (5/2) CF . EF
30 = (5/2) EF
EF = 30 . (2/5)
EF = 12
Verified answer
Pelajaran :MatematikaKelas :9
Bab :1
Nama Bab :Kesebangunan dan Kekongruenan
Kode mapel:2
Kode :9.2.1
Jawab:
5)
AD=AB-BD
=(16cm)-(8cm)
=8cm
//cara perbandingan//
BC=AB/AD×DE
=16cm/8cm×6cm
=2×6cm
=12cm
6)
EF=(FB×DC)+(CF×AB)/(FB+CF)
=(3×20cm)+(2×30cm)/(2+3)
=60cm+60cm/5
=120cm/5
=24cm