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

since C=πd for a whole circle, you have

1/2 * 20π = 10π meters

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

This is absolutely correct

15.70

15.70 is the exact answer, but to the nearest meter, it should be rounded to 16 meters.

I am sorry, but I am not sure what you are asking for. Could you please provide more information or context about what you need help with?

P=1/2×3.14×10

Reason why it is 10 is because it is the half 20 ,and the half of a diameter is the radius so we have found are radius
=3.14×5
=15.70

Yes, that's correct. The length of the steel beam, to the nearest meter, is 15 meters, as it should be rounded to the nearest whole number.

Maths

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