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Rumus praktis matematika kelas IX ( 3 SMP)
Dari gambar berikut ini, PQ // AB. Panjang PQ adalah …
Penyelesaian cara biasa
PQ
=
AD
DPxAB
APxDC
)
(
)
(
+
=
13
)
28
4
(
)
15
9
(
x
x
+
=
13112
135+
=13
247
= 19 cm
Penyelesaian cara cepat
Perhatikan bangun datar yang baru !
PQ = PT + 15
AM
PT
AD
DP=13
13
4
PT
=
PT = 4 cm
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