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Complementary Angle
Sum equals 90^{o}

Supplementary Angle
Sum equals 180^{o}

Perpendicular Line
Intersection forms right angle

Transversal
When 2 lines are cut by 3rd line, 3rd line is a transversal

Scalene Triangle
No equal sides & no equal angles

Isosceles Triangle
2 equal sides
 If you know value of 1 equal side, you can find out value of all angles

Equilateral Triangle
 All sides & angles are equal
 Measure of each angle is 60^{o}

Right Triangle
The side opposite of the right angle is call hypotenuse

306090 Triangle
 It is an equilateral triangle cut in middle
 The side opposite the 90^{o }angle is always twice as long as the side opposite the 30^{o }angle.
 The side opposite the 60^{o }angle is always √3 times as long as the side opposite the 30^{o }angle

454590 Triangle
 Lives a double life: it is both an isosceles & right triangle
 The side opposite the 90^{o }angle is always √2 times larger than the two equal sides that sit opposite the 45^{o }angles

The Pythagorean Theorem
c^{2 }= a^{2 }+ b^{2 }
 Pythagorean Triples: {3,4,5}, {5,12,13}, {8,15,17}, {7, 24, 25}, {9, 40, 41}.

Similarity of Triangles
Similar  of the same shape (Proportional)

Congruence
Two triangles that are IDENTICAL.
 Two triangles are congruent if they meet these:
SideSideSide(SSS)
SideAngleSide(SAS)
AngleSideAngle(ASA)

Perimeter of Triangle
Sum of lengths of triangle;s three sides

Area of Triangle
1/2 Base x Height

Polygon
Twodimensional figure with 3 or more straight sides

Perimeter of Polygon
Sum of lengths of its sides

Number of Degrees Polygons Hold
 180^{o }x (n2)
  Ex. Triangle 180^{o }x (1) = 180^{o }

Parallelogram
4 sided figure(quadrilateral) whose opposite sides are parallel.
  Opposite sides are equal in length
  Opposite angles are equal
  Adjacent angles are supplementary
  Diagonals bisect eachother

Rhombus
Parallelogram where all 4 sides are equal in length

Area of Parallelogram
(Base x Height) well....(Base x Altitiude)

Trapezoid
One pair of sides is parallel while other is not

Area of Trapezoid
A = 1/2 (b_{1 }+ b_{2}) x h

Circumference of a Circle
2πr


Arc of Circle
Line segment that is wrapped AROUND the circle with 2 points

Chord of Circle
STRAIGHT line segment ACROSS the circle with 2 points

