tentukan jari jari dan diameter dari masing-masing lingkaran di bawah ini a. k = 22cm π = 22/7
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K = πd
22 = 22/7 × d
d = 22 ÷ 22/7
d = 22 × 7/22
d = 154/22
d = 7 cm
Panjang diameter = 7 cm
Panjang jari-jari = d/2 = 7/2 = 3,5
Ket:
K = Keliling
d = diameter
r = jari-jari
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rumus mencari diameter :
[tex] \\ \\ rumus \: mencari \: diameter \\ d \: = \frac{k}{\pi} \\ \\ \\ rumus \: mencari \: jari \: jari \\ r = \frac{k}{2 \times \pi} [/tex]
penyelesaian :
diameter
[tex]d = 22 \div \frac{22}{7} = \frac{22}{1} \times \frac{7}{22} = 7 \\ d = 7[/tex]
jari jari
[tex]r = \frac{22}{2 \times \frac{22}{7} } = 22 \div \frac{44}{7} = \frac{22}{1} \times \frac{7}{44} = \frac{7}{2} = 3.5[/tex]
r = 3,5
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