Orthocenter - //where the triangles 3 altitudes meet
Scalene triangle - //no equal sides of angles
Isosceles - //Has 2 equal sides and 2 equal angles often called
base angles
Equilateral Triangle - //All 3 sides and angles are equal 60 degrees
Rigth triangle - //Has one right angle 90 and two acute angles
Acute triangle - //all 3 angles less than 90
Obtuse - //2 acute and one angle greater then 90
Triangle inequality theorem - //states that the sum of any two
sides of a triangle must be greater than the third side
Third-side rule of triangles - //three sides, a, b, c. c-b < a < c+b
Triangle - //3 internal angles add to 180, 3 sided
,Angle Bisector - //extends from one side to BISECT the opposing
angle
Triangle altitude - //the shortest distace from a vertex angle to the
side containing the base
Triangle Median - //extends from one angle to BISECT the opposite
side
Two centers of a triangle - //Centroid or orthocenter
Pythagorean Theorem - //The relatioship between the sides of a
right triangle is a2 + b2 = c2 (all squared) where c is the
hypotenuse and is across from the right angle.
Right triangle with angle measurements 90-45-45 - //Special right
triangle. the hypotenuse is equal to the square root of 2x
Right triangle with angle measurments 90-60-30 - //Special right
trianlge.hypotenuse is 2x. the short side is x and the long side is
square root of 3x
Quadrilaterals - //A closed, 4 sided shape. The sum of all 4 sides is
always equal to 360. The AREA of quadrilateral is always A= bh
(base time height)
, Parallelogram - //A quadrilateral with two pairs of equal side. Two
consecutive sides in a parallelogram are supplementary = 180
Rectangle - //two pairs of equal sides and four right angles
Kite - //two pairs of equal sides but the equal sides are
consecutive
Square - //4 right angles and 4 equal sides
Rhombus - //4 equal sides. diagonals bisects angles and bisect
one another
Trapezoid - //One pair of sides is parallel
bases have different lengths
Polygons - //Any closed shape made up of 3 or more line
segments. Hexagon = 6, Octagon = 8
The sum of all exterior angles in a polygon is 360
Finding the sum of the interior angles of polygons - //(n-2) x 180
where n is the number of sides the polygon has. To find a single
interior angle simply divide the total interior angles by the # of
sides and therefor angles
Apothem - //the shortest PERPENDICULAR distande from one of
the sides to the center
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