What is the radius of the wheel if it has a circumference of 88cm?

Mduara wa duara ($C$) hutolewa na formula:

$$C = 2\pi r$$

ambapo $r$ ni kipenyo na $\pi$ ni takriban $\frac{22}{7}$.

Tunapewa $C = 88$ cm.

$$88 = 2 \times \frac{22}{7} \times r$$

Kwanza, zidisha namba upande wa kulia:

$$88 = \frac{44}{7} \times r$$

Ili kupata $r$, zidisha pande zote mbili kwa $\frac{7}{44}$:

$$r = 88 \times \frac{7}{44}$$ $$r = \frac{88 \times 7}{44}$$

Gawanya 88 kwa 44:

$$r = 2 \times 7$$ $$r = 14 \text{ cm}$$

Kipenyo ni 14 cm, ambayo inalingana na chaguo D.

Jibu sahihi ni:
D) $\boxed{\text{14 cm}}$