perimeter_of_quarter_circle = 1/2πr + 2r
For the arc bit of the perimeter:
circumference of circle = 2 x π x radius
quarter of this = 1/2 x π x radius
The two straight sides are radii which need to be added on making:
perimeter_of_quarter_circle = 1/2 x π x radius + 2 x radius
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The arc is one quarter of a circle so is 2pir, the other components of the quarter circle are the two radii, so perimeter is 2r+2pir = 2r(1+pi)
Oh, dude, the perimeter of a three quarter circle is basically the same as the circumference of a full circle minus a quarter of it. So, you just take the formula for the circumference of a circle (2πr) and multiply it by 3/4. Easy peasy, lemon squeezy!
There is no such thing as the perimeter of a circle. The circumference, however, is 12.4*pi (since the formula is pi*diameter)
The formula to find the perimeter of a cone is not commonly used, as the perimeter is typically associated with two-dimensional shapes like circles and polygons. However, if we consider the base of the cone as a circle, the perimeter would be the circumference of the base circle. The formula for the circumference of a circle is 2πr, where r is the radius of the circle. So, the perimeter of a cone would be 2π times the radius of the base circle.
There are different formulae for the perimeter, area or other aspects of each shape. Furthermore, the formula may well depend on what information is available to you.