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Maka:
<C = 180' - (<A + <B)
<C = 180' - (60+75)'
<C = 180' - 135'
<C = 45'
Karena <C = 45', maka berlaku <C = <R
Dari 2 pernyataan:
<B = <P = 75'
<C = <R = 45'
Tentu yang belum adalah:
<A = <Q = 60'
Sehingga, dari kesimpulan tersebut:
AB sebanding PQ
AC sebanding QR
BC sebanding PR
Atau:
AB/PQ = AC/QR = BC/PR