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Published byGabriella Woods
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triangle – a three sided polygon (straight sides; closed) A B C 3 sides: 3 angles: 3 vertices: A, B, C
Classify triangles by sides isosceles triangle – at least two sides are congruent D F E legs: base:
Classify triangles by sides scalene triangle – no sides are congruent
Classify triangles by sides equilateral triangle – all three sides are congruent
Classify triangles by angles acute triangle – all three angles are acute (less than 90º)
Classify triangles by angles right triangle – one right angle (exactly 90º) & two acute angles; the acute angles are complementary (they add up to 90°) KM L legs: hypotenuse:
Classify triangles by angles obtuse triangle – one obtuse angle (more than 90º) & two acute angles
Classify triangles by angles equiangular triangle – all three angles are congruent (60º)
altitude or “height” - a segment from a vertex perpendicular to the opposite side; may be inside, outside or on the triangle
median – “middle” – segment from a vertex to the midpoint of the opposite side; must be inside the triangle
angle bisector – segment from a vertex to the opposite side that bisects the angle
CHAPTER 4 Congruent Triangles SECTION 4-1 Congruent Figures.
4-7 Median, Altitude, and Perpendicular bisectors.
Basic Definitions in Geometry
ADVANCED GEOMETRY 3.6 Types of Triangles LEARNER OBJECTIVE: Students will classify triangles by sides and by angles and will complete problems and proofs.
Classifying Triangles Students will classify triangles using the lengths of the sides and the angles. S. Calahan October 2010.
Classify Triangles Standard 4C.
Definitions of Key Geometric Terms A quick review of material covered in Math A La Salle Academy, Mrs. Masullo.
4.6 The Isosceles Triangle Theorems Base Angles and Opposite Sides Hypotenuse - Leg.
4.5 Isosceles and Equilateral Triangles. Isosceles Triangles At least two sides are of equal length. It also has two congruent angles. Base Angles Base.
Isosceles and Equilateral Triangles Section 5-1. Isosceles Triangle A triangle with at least two congruent sides. Leg Leg Base Vertex Angle Base Angles.
1Geometry Lesson: Polygons, Triangles Aim: Do Now: 2) Which of the following shapes are polygons? e) a) b) c) d) f) What are polygons? How do we classify.
1 4-5 Isosceles and Equilateral Triangles State and apply the Isosceles Triangle Theorem and its converse State and apply the corollaries for equilateral.
Defining Triangles During this lesson, you will define triangles and their parts.
5-1 Classifying Triangles
4-1 Classifying Triangles. What Is a Triangle? A triangle is a three-sided polygon. Sides: Vertices: G, E, and O Angles: EO G.
Wednesday, September 26, 2012 Homework: p. 185 #31, 34, 43 & 44 (36-42 mentally)
2.7 – Triangles. Type of ∆DefinitionPicture Equilateral Triangle CLASSIFICATION BY SIDES All sides are ≅
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