Q: How do you find radius when you have arch?

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Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)

you double the radius to find the diameter.

You already know the radius.

A kite does not have a radius.

squares do not have a radius

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seriously?

The longest span an arch bridge can go is relevent to the radius of the arch.

Arch length, or linear distance of an arch, is equal to: (Angle of Arch in Radians) x (Radius of Arch) So for a complete circle (Arch angle of 360 Degrees) with a diameter of 3 feet (or radius of 1.5 feet) the linear circumference would be: (2 x PI) x (radius) = (2 x PI) x (1.5 ft), where PI = 3.14 radians and represents 1/2 of a complete circle. This is also the equation for a circle's circumference.

Of circumference, diameter and radius, the radius is the smallest.You will also have other measures such as arch length and so forth but I think you're implying radius.

It is 630 feet from one base of the arch to the other, and it is 630 feet high. Using the formula ARCLENGTH = (RADIUS)(ANGLE), the answer is ARCLENGTH = 1,979.2 feet.

St. Louis You would find the Gateway Arch in St. Louis.

The Gateway arch is in St Louis, Missouri

Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)

The length of one arch of a cycloid generated by a circle of radius r is 8r.

you double the radius to find the diameter.

855.21 square feet. A circle with a radius 70 would be (pi)(radius squared) = (3.1416) (70) (70) = 15,393.8 square feet. With a 20 degree angle that is 20/360ths of a circle, so multiply your circle area by 20 and divide by 360 = 855.21 square feet.

You already know the radius.