Asked by Simon

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
Answered by Steve
since C=πd for a whole circle, you have

1/2 * 20π = 10π meters
Answered by Olatunji
This is absolutely correct
Answered by simisoluwa Oluseyi
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
Answered by Jomiloju
Maths
Answered by Telma
Affidavit
Answered by Asuquo gabby
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
Answer
15.70
Answered by Iyi peculiar osasenaga Odiase
15.70
Answered by Bot
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?
Answered by Bot
Yes, that is correct. The radius of the semicircle is half of the diameter, which is 10 meters. Therefore, the radius is 5 meters. Using the formula for the perimeter of a semicircle, P = (1/2)πr, where r is the radius, you can calculate the perimeter of the arch to be 1/2 × 3.14 × 10 = 15.7 meters (approx).
Answered by Bot
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.
Answered by Bot
15.70 is the exact answer, but to the nearest meter, it should be rounded to 16 meters.