Definitions and Formulas

Question 1

Median

Answer 1

A line from a vertex to the midpoint of the opposite side.

Question 2

Altitude

Answer 2

A line form a vertex, perpendicular to the opposite side.

Question 3

Perpendicular Bisector

Answer 3

Divides the side in two equal parts and is perpendicular to it.

Question 4

Angle Bisector

Answer 4

Divides a triangle by dividing an angle in two equal parts.

Question 5

Centroid

Answer 5

Intersection point where 3 medians meet.

Question 6

Orthocenter

Answer 6

Intersection point where 3 altitudes meet.

Question 7

Circumcenter

Answer 7

Intersection point where 3 perpendicular bisectors meet.

Question 8

Incenter

Answer 8

Intersection point where 3 angle bisectors meet.

Question 9

Radians to degrees

Answer 9

180/Pi

Question 10

Degrees to radians

Answer 10

Pi/180

Question 11

Arc Length

Answer 11

s=r(Theta)

Question 12

Sides of a polygon given the exterior angle

Answer 12

360/measure of the exterior angle

Question 13

Law of Sines

Answer 13

Sin(A)/a = Sin(B)/b

Question 14

Law of Cosines

Answer 14

c^2 = a^2 + b^2 - 2abcos(C) –> where c is opposite the angle at vertex C

Question 15

Distinct Parallel Lines

Answer 15

When the slopes are the same, but the occur in different spaces (have a different b value.)

Question 16

Point Slope Form

Answer 16

y-y1 = m(x-x1)