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Calculate the circumference of a circle whose radius is 1.68cm. 2. The circumference of a circle is 187cm. Calculate its diameter. 3. A wheel has a diameter of 70cm. How many meters will it cover after making 300 revolutions?

Mathematics

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Sawa Sammybaraka, hebu tuangalie swali la kwanza.

1. Calculate the circumference of a circle whose radius is 1.68cm.

  1. Kwanza, tafuta kipenyo (diameter) cha duara.

    Tunajua kuwa kipenyo ni mara mbili ya rediasi (D=2rD = 2r).

    D=2×1.68 cmD = 2 \times 1.68 \text{ cm} D=3.36 cmD = 3.36 \text{ cm}

  2. Tumia fomula ya mzingo wa duara, C=πDC = \pi D.

    Tutatumia π=227\pi = \frac{22}{7}.

    C=227×3.36 cmC = \frac{22}{7} \times 3.36 \text{ cm}

  3. Fanya hesabu.

    C=22×3.367 cmC = 22 \times \frac{3.36}{7} \text{ cm} C=22×0.48 cmC = 22 \times 0.48 \text{ cm} C=10.56 cmC = 10.56 \text{ cm}

    Mzingo wa duara ni 10.56 cm\boxed{\text{10.56 cm}}.

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