Triangles Triangle: a figure formed when 3 noncollinear points are connected by segments. Components of a triangle: Vertices: A, B, C Sides: AB, BC, AC.

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Presentation transcript:

Triangles Triangle: a figure formed when 3 noncollinear points are connected by segments. Components of a triangle: Vertices: A, B, C Sides: AB, BC, AC Angles: A, B, C

Triangles can be classified by Angles: 1) Acute - 3 acute angles 2) Obtuse - 1 obtuse angle 3) Right - 1 right angle

or Sides: 1) Scalene - no sides congruent 2) Isosceles - at least 2 sides congruent 3) Equilateral - all sides congruent

Focus on Isosceles Triangles Vertex angle: the angle formed by the congruent sides C Base: the side opposite the vertex angle Legs: the two congruent sides and Base Angles: the two angles formed by the base and one of the congruent sides  A and B

Application Find d and the measure of each side of equilateral triangle KLM if KL = d + 2 LM = 12 - d KM = 4d - 13

Triangles on the Coordinate Plane Classify RST by sides R (-1, -3) S (4, 4) T (8, -1)

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Homework

Homework