If given two sets of points and you want to find slope, subtract both Ys as your 'rise' and subtract both x's as your 'run' for rise / run. Slope of 2 (m = 2), could mean (-2, -1) because if you divide -2/-1 = 2. All you need are two sets of point.Īny horizontal line has a firm y-axis (y-axis never changes but x-axis does) so y = k always.Īny vertical line has a firm x-axis which doesn't change, so X=KĪny two points that share same y-coordinate must be a horizontal line.Īny two points that share same x-coordinate, must be vertical line. If you are given two sets of x and y (1,-3), (2, 4), you can always plot the line. Sum of measure of internal angles of polygon is n sides minus 2 (ie number of triangles within polygon) x 180 degrees (ie degrees of a triangle) Then take final answer and multiply by GCF to scale back up.Ĭommon Pythagorean triplets: 3,4,5 5,12,13 8,15,17 7,24,25 Then do Pythagorean with smaller numbers. If you are using the Pythagorean theorem - a^2 + b^2 = c^2, and the numbers are too big. Right triangle - 2 sides that make up the 90 degrees are called legs and the opposite long side is called the hypotenuse. So it plays many important roles.Įquilateral - 3 equal sides with 3 equal angles. In isosceles triangle, line that bisects vertex also marks midpoint of base and forms right angle. Isosceles triangles are also equilateral triangles. Isosceles - 2 (or more) sides are equal, thus 2 angles opposite those lines are equal (2 way theorem). The sum of the total of 3 angles must be 180 degrees. The sum of any two sides must be bigger than the 3rd side.Īny side of a triangle must be greater than the difference of the two other sides and less than the sum of the two other sides. Sum of measure of polygon with n sidesThe largest angle is always opposite of largest side (visa versa) If polygon has n sides, it can be divided into n-2 triangles.
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