If you the radius of the circle is r then the perimeter of a quadrant = r*(2 + pi/2).
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In a circle of radius, r, perimeter of quadrant = pi*r/2 + 2r = r*(pi/2 + 2)
The perimeter of a triangle is the distance around it. Add the lengths of the three sides to find the perimeter.
If the radius of the circle is r, then the area of the quadrant is 0.25*pi*r^2
you can only find the perimeter of shapes, honey, not fractions.
To find the perimeter of a figure, add all the lengths of the edges of the figure. The sum of the sides is the perimeter.