Page 63 - Inovasi Modul Matematika Bangun Datar Segi Empat_Lusi Malini_Neat

400 = 16x + 256

400 – 256 = 16 x

144 = 16 x

x = = 9

2
3. Diketahui : luas = 168 cm
QS = 16 cm

PO : OR = 5 : 2

Ditanya : keliling ?

Jawab :

L = × d × d 2
1

L = × PR x QS

168 = × PR × 16

168 = 8 PR

PR = =

PO = = . 21 = 15 cm

OR = = . 21 = 6 cm

PQ = PS = √

PQ = PS = √ 5 8 = √ 5 64 = √ 89 = 7

QR = RS = √

QR = RS = √8 6 = √64 6 = √ =

Keliling = 2 (PQ + QR)

Keliling = 2 (17 cm + 10 cm)

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Bangun Datar Segiempat - VII