Page 45 - Modul Bangun Datar Segi Empat_Neat
P. 45
L = = 10 24 = 120
2
2
2 2
2
10. 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
OR = 2 = . 21 = 6 cm
2
2
PQ = PS = √ +
2
2
2
PQ = PS = 15 + 8 = 225 + 64 = 289 = 17
2
QR = RS = √ +
2
2
2
QR = RS = 8 + 6 = 64 + 36 = 100 = 10
Keliling = 2 (PQ + QR)
Keliling = 2 (17 cm + 10 cm)
Keliling = 2 (27 cm)
Keliling = 54 cm
43
Bangun Datar Segi Empat - VII
