Circles

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Circles

Area

Area of a circle is like the area of a rectangle because the height of a rectangle would be the radius of a circle and the base would be π x r. = π x r x r So the overall formula for the area of a circle is: π(r^2)

π (Pi)

π aka pi can be calculated by dividing the circumference and the diameter together and it should be roughly 3.14

Circumference

The two formulas to calculate the circumference are: c = π(d) aka π x d c = 2πr which also means 2 x π x r

Circumference is like the boarder around the circle. If you were to straighten out the perimeter of the circle or the boarder, That would be the arc length of the circle. Press the cool looking circle beside this paragraph and use it to help you.

Diameter

There are two formulas to find the diameter: d = 2(r) aka 2 x r d = c/2

Diameter is a line that cuts the circle into two equal parts but not necessarily CUT. The line just shows the two equal parts on the given circle.

Radius

There are two formulas to get the radius: r = d/2 (diameter in short is (d)) r = c/2π (circumference in short is (c))

Subtopic

The radius is the distance from the center point to the edge of the circle. Radius in short form would be (r) Plural form of radius: Radii All radii of a given circle are congruent