The sum of the measures of the interior angles of the polygon above is 180o = 540o
AC2 = AB2 + BC2.
Pythagorean Theorem applied to the triangle above: AC2 = AB2 + BC2.
Equilateral triangle.
a = b = c = 60o
AB = BC = CA
Isosceles triangle.
b = c
AB = AC
a b.
BC AC
In any triangle, the longest side is opposite the largest angle, and the shortest side is opposite the smallest angle.
Area, Perimeter and Volume
Rectangle Perimeter
2a + 2b
Rectangle Area
ab
Triangle Perimeter
AB + BC + CA
Triangle Area
BC
Circle Perimeter
2Circle Area
Cube Volume
a3
Cylinder Volume
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