
BANGUN DATAR
Presentation
•
Mathematics
•
4th Grade
•
Hard
fany firdaus
FREE Resource
7 Slides • 0 Questions
1
BANGUN DATAR
C. Luas Bangun Datar
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1. Persegi
Luas persegi adalah L
Sisi persegi adalah s,
maka rumus untuk menentukan luas
persegi adalah :
L = s x s
atau L = s².
Sedangkan untuk mencari sisi persegi adalah
4
Contoh soal 4.12
Tentukan luas persegi di samping!
Penyelesaian:
S = 11 cm
L = s x s
L = 11 x 11
L = 121
Jadi, luas persegi adalah 121 cm².
5
Contoh 4.13
Tentukan panjang sisi persegi jika diketahui luas persegi 225 cm².
Penyelesaian:
s = L
s = 225
Untuk menarik akar kuadrat, perhatikan langkah-langkah berikut :
15 x 15 = 225
Dengan demikian,
s = 225 = 15
6
Ayo berlatih
Tentukan luas persegi berikut!
7
Tentukan panjang sisi persegi berikut!
BANGUN DATAR
C. Luas Bangun Datar
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