3 years ago

The radius of a circle is 8 cm Calculate the circumference of the circle [Use pi r = 3.1]

1 answer:

3 0

Answer:

Radius is 8 cm, this means that the diameter is 16 cm. the circumference formula is 2(pie)R 2x3.14xRadius... Your answer is 50.265CM

Step-by-step explanation:

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An arch is in the shape of a parabola. It has a span of 100 feet and a maximum height of 25 ft.

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Answer:

$y=-\frac{1}{100}(x-50)^2+25$

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Step-by-step explanation:

An arch is in the shape of a parabola. It has a span of 100 feet, the vertex lies at the center 50 and the maximum height of 25 ft.

Vertex at (50,25)

vertex form of the equation is

$y=a(x-h)^2+k$ , (h,k) is the center

$y=a(x-50)^2+25$

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$0=a(0-50)^2+25$

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divide both sides by 2500

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$y=-\frac{1}{100}(x-50)^2+25$

the height of the arch 10 feet from the center.

center is at 50, 10 feet from the center so x=40 and x=60

$y=-\frac{1}{100}(40-50)^2+25$

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