Nomor 6
Dik:
panjang sisi persegi = 25 cm
Luas = ?
Luas persegi = s x s
= 25 x 25
= 625 cm²
Nomor 7
Luas = 480 cm²
l = 15 cm
p = ?
L = p x l
480 = p x 15
p = 480 / 15
p = 32 cm
Nomor 8
Keliling = 90cm
panjang = 15 cm
lebar =?
keliling persegi panjang = 2p + 2l
90 = (2 x 15) + 2l
90 = 30 + 2l
90 - 30 = 2l
60 = 2l
l = 60 / 2
l = 30 cm
Nomor 9
panjang sisi = 40 cm
= 40 x 40
= 1.600 cm²
Nomor 10
panjang = 300
panjang = 130 cm
keliling = ?
= (2 x 300) + (2 x 130)
= 600 + 260
keliling papan tulis = 860 cm atau 8,6 m
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Nomor 6
Dik:
panjang sisi persegi = 25 cm
Luas = ?
Luas persegi = s x s
= 25 x 25
= 625 cm²
Nomor 7
Dik:
Luas = 480 cm²
l = 15 cm
p = ?
L = p x l
480 = p x 15
p = 480 / 15
p = 32 cm
Nomor 8
Keliling = 90cm
panjang = 15 cm
lebar =?
keliling persegi panjang = 2p + 2l
90 = (2 x 15) + 2l
90 = 30 + 2l
90 - 30 = 2l
60 = 2l
l = 60 / 2
l = 30 cm
Nomor 9
Dik:
panjang sisi = 40 cm
Luas = ?
Luas persegi = s x s
= 40 x 40
= 1.600 cm²
Nomor 10
panjang = 300
panjang = 130 cm
keliling = ?
keliling persegi panjang = 2p + 2l
= (2 x 300) + (2 x 130)
= 600 + 260
keliling papan tulis = 860 cm atau 8,6 m