Luas lingkaran yang kelilingnya 88cm adalah...?

r = 88 × 7/44 = 14 cm

L = 22/7 × 14² = 616 cm²

Pembahasan :
Diameter lingkaran
[tex] = \frac{K}{\pi} = \frac{22}{7} \div 88 \\ = \frac{7}{22} \times 88 = \frac{616}{22} = 28 \: \: cm[/tex]

Luas lingkaran
[tex] = \pi \times {r}^{2} \\ = \frac{22}{7} \times 14 \times 14 \\ = 616 \: \: {cm}^{2} [/tex]

Good Luck ^^