Bangun datar
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Transcript of Bangun datar
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Bangun Datar
Oleh :Rina Suliana
113102623F
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Berapa Satuan ?
Satu Satuan
Luas Persegi Panjang
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1 2 3 4 5
1
2
3
Luas Persegi : Panjang X Lebar5 X 3 = 15
Panjang
Lebar
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Keliling Persegi Panjang
A B
CD
Keliling Persegi Panjang = AB + BC +CD + DA
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Luas Persegi
Keliling Persegi
s
s
Memiliki
Panjang
Keempat
Sisi yang
sama
Luas Persegi =
Sisi x sisi
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D
A B
C
Keliling Persegi = sisi x 4
= AB + BC + CD + DA
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p
l
L = p x l
L = ½ x p x l
L = ½ x a x t
a
t
Luas Segitiga
Keliling Segitiga
Keliling = AB + BC + CD
C
BA
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a
t
Luas Jajar Genjang
Luas = a x t
Keliling
Keliling = AB + BC + CD + DA
A B
CD
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a2
a1
0,5 t
0,5 t
a2
a1
Luas Trapesium
Luas Trapesium = (0,5t x a1) + (0,5t x a2)0,5t (a1 + a2)
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0,5 t
0,5 t
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1. Perhatikan gambar dibawah yang berbentuk persegipanjang 5 cm x 6 cm. Luas daerahABCD adalah ….
30 cm² 14 cm²
18 cm² 12 cm²
F
GH
E
a
b
c
d
2. Ruangan mempunyai ukuran 6,8 m x 5,2 m akan dipasang ubin persegi. Banyak ubinminimal adalah ….
200 240
221 300
a
b
c
d
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E F
GHI
IIIIV
II
L I = ½ x a x t = ½ x 2 x 4 = 4LII = ½ x a x t = ½ x 1 x 1 = ½ LIII = ½ x a x t = ½ x 3 x 5 = 7½LIV = ½ x a x t = ½ x 2 x 4 = 4L persegi panjang = p x l = 5 x 6 = 30
Sehingga luas bangun ABCD = L EFGH – (LI + LII + LIII + LIV)= 30 – ( 4 + ½ + 7½ + 4 ) = 30 – 16 = 14
To Soal
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Pembahasan :
Ukuran ubin paling besar 40 x 40
muka luas ubin = 1600
Sedangkan luas ruangan = 6,8 m x 5,2 m
= 680cm x 520cm
= 353600 cm2
Sehinnga banyak ubin minimal = 353600 : 1600 = 221 buah
To Soal
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KLIK
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