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→Area of a triangle: equilateral triangle
volume of a sphere and a cone |
→Area of a triangle: equilateral triangle |
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= Area and perimeters = | |||
== Circumference of a circle == | |||
<math>C = 2 \pi r</math> | |||
== Area of a circle == | |||
<math>A = \pi r^2</math> | |||
== Perimeter of a triangle == | |||
<math>P = a + b + c</math> | |||
[[File:Triangle-math.png|frameless]] | |||
== Area of a triangle == | |||
<math>A = \frac{1}{2} bh</math> | |||
* The area of an equilateral triangle is | |||
<math>A = \frac{1}{4}s^2\sqrt{3}</math> | |||
= Volume and surface area = | = Volume and surface area = | ||
== Volume of a cube == | |||
<math>v(x) = x^3</math> | |||
== Surface area of a sphere == | |||
<math>A(r) = 4\pi r^2</math> | |||
== Volume of a sphere == | == Volume of a sphere == | ||
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where ''r'' is the radius of the base, and ''h'' is the height of a cone | where ''r'' is the radius of the base, and ''h'' is the height of a cone | ||
== Volume of a cylinder == | |||
This only applies to a right cylinder. | |||
<math>v(r) = {\pi}r^2h</math> | |||
where r is the radius of the base, and h is the height of a cylinder | |||