luas bangun di samping adalah

luas 1/4 lingkaran = 1.4 × 22/7 × 7 × 7
=38.5 cm^2 (C)

[tex]luas = \frac{1}{4} \times \pi \times {r}^{2} \\ = \frac{1}{4} \times \frac{22}{7} \times {7}^{2} \\ = \frac{1}{4} \times \frac{22}{7} \times 49 \\ = \frac{1078}{28} \\ = 38.5 \: {cm}^{2} [/tex]