Page 52 - Modul Elektronik Bangun Datar Segi Empat_Neat

2
luas = 48 cm
Ditanya : d ?
2
Jawab :

=
2
2
2

2
48 = 8 2
2
2
48 = 4
2

= = 12
2

2
9. Diketahui : luas = 168 cm

QS = 16 cm

PO : OR = 5 : 2

Ditanya : keliling ?

Jawab :

L = × d × d
2 1 2

L = × PR x QS
2

168 = × PR × 16
2
168 = 8 PR

PR = = 21

PO = = . 21 = 15 cm
2

2 2
OR = = . 21 = 6 cm
2

2
PQ = PS = √ +
2
2
PQ = PS = 15 + 8 = 225 + 64 = 289 = 17
2
2
QR = RS = √ +
2
50

Bangun Datar Segi Empat - VII