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diketahui:
AB = 20
CD = 12
DE = 6
AE = 9
AD = AE + ED
= 9 + 6
= 15
ditanya:
panjang EF = ... ?
rumus yang digunakan
EF = (AB x DE + CD x AE) / AD
jawab :
EF = (AB x DE + CD x AE) / AD
= (20 x 6 + 12 x 9) / 15
= (120 + 108) / 15
= 228 / 15
= 15,2
jadi panjang x = 15,2
jawaban A
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kelas : 9 SMP
mapel : matematika
kategori : kesebangunan
kata kunci : panjang EF
kode : 9.2.1 [matematika SMP kelas 9 Bab 1 kesebangunan]