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an arch of a bridge is made by bending a steel beam into the shape of a semi circle, if the span (diameter) of the arch is 20m, use the value 3.14 for π to find the length of the steel beam to the nearest meter

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  1. since C=πd for a whole circle, you have

    1/2 * 20π = 10π meters

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  2. This is absolutely correct

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  3. We have a semi circle, so we can conclude that the semi circle Can be represented with 1/2.The formula for the perimeter of a circle is 2πr,so for a semi circle 1/2π.Let's begin. P=1/2πr. P=1/2×22/7×20. =220/7 =31.4

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