1. diketahui diameter = 20cm, maka luasnya adalah
[tex]keliling = \pi \times d \\ = 3.14 \times 20 \\ = 62.8cm[/tex]
2. diketahui jari jari = 7cm , maka luas ¼ lingkaran adalah
[tex]luas = \frac{1}{4} \times \pi \times r {}^{2} \\ = \frac{1}{4} \times \frac{22}{7} \times 7 {}^{2} \\ = 154cm {}^{2} \\ [/tex]
3
[tex]keliling = (\frac{3}{4} \times 2 \times \pi \times r) +( 2 \times 14) \\ = ( \frac{3}{4} \times 2 \times \frac{22}{7} \times 14) + (2 \times 14) \\ = 66 + 28 \\ = 94cm[/tex]
4
[tex]luas = \frac{3}{4} \times \pi \times r {}^{2} \\ = \frac{3}{4} \times 3.14 \times 10 {}^{2} \\ = 235.5cm {}^{2} [/tex]
5
[tex]luas = \frac{1}{2} \times \pi \times r {}^{2} \\ = \frac{1}{2} \times \frac{22}{7} \times 35 {}^{2} \\ = 1.925cm {}^{2} [/tex]
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