Example:
What is the circumference of a circle having a diameter of 7.9 cm, to the nearest tenth of a cm? Using an approximation of 3.14159 for , and the fact that the circumference of a circle is times the diameter of the circle, the circumference of the circle is Pi × 7.9 3.14159 × 7.9 = 24.81…cm, which equals 24.8 cm when rounded to the nearest tenth of a cm.
or you could just measure it using a string and save yourself the math
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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 many formulas for perimeter depending on what shape you are trying to find the perimeter of. The perimeter is the distance around a shape, so one formula to find perimeter is simply adding all the side lengths together.
The equivalent of a "perimeter" in a circle is actually called its circumference. To get the diameter, just divide the circumference by pi.
add the perimeter of the rectangle, minus the side that'c covered by the semi circle. then, find the circumference of the semi circle [diameter x pi, divided by 2] and addd them together