Jawab:
Pembahasan:
1. diketahui
jari jari = 8cm
π = 3,14
ditanya:
keliling?
jawab:
keliling = 2 × π × r
= 2 × 3,14 × 8
= 50,24cm
2. diketahui :
diameter = 10cm
jari jari = 10:2 = 5cm
= 2 × 3,14 × 5
= 31,4cm
3.diketahui:
keliling = 99cm
jari jari:
r = (7 x K) ÷ 44
r = (7 x 99) ÷ 44
r = 693 ÷ 44
r = 15,75cm
4. diketahui:
keliling = 23,55cm
diameter:
d = (7 x K) ÷ 22
d = (7 x 23,55) ÷ 22
d = 164.85 ÷ 22
d = 7.49318181818cm
5. diketahui:
r : 14cm
sudut pusat : 135°
panjang busur lingkaran?
Panjang busur
= 135°/360° × Keliling lingkaran
= 3/8 × 2 π r
= 3/8 × 2 × 3,14 × 14
= 3/8 × 88
= 33 cm
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Jawab:
Pembahasan:
1. diketahui
jari jari = 8cm
π = 3,14
ditanya:
keliling?
jawab:
keliling = 2 × π × r
= 2 × 3,14 × 8
= 50,24cm
2. diketahui :
diameter = 10cm
jari jari = 10:2 = 5cm
π = 3,14
ditanya:
keliling?
jawab:
keliling = 2 × π × r
= 2 × 3,14 × 5
= 31,4cm
3.diketahui:
keliling = 99cm
π = 3,14
ditanya:
jari jari:
jawab:
r = (7 x K) ÷ 44
r = (7 x 99) ÷ 44
r = 693 ÷ 44
r = 15,75cm
4. diketahui:
keliling = 23,55cm
π = 3,14
ditanya:
diameter:
jawab:
d = (7 x K) ÷ 22
d = (7 x 23,55) ÷ 22
d = 164.85 ÷ 22
d = 7.49318181818cm
5. diketahui:
r : 14cm
sudut pusat : 135°
π = 3,14
ditanya:
panjang busur lingkaran?
jawab:
Panjang busur
= 135°/360° × Keliling lingkaran
= 3/8 × 2 π r
= 3/8 × 2 × 3,14 × 14
= 3/8 × 88
= 33 cm
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