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Published bySamuel Parrish
Modified over 4 years ago
Classification by sidesEquilateral has all sides congruent Isosceles has 2 congruent sides Scalene has no congruent sides
Classification by AnglesAcute has 3 angles less than 90° Right triangle has 1 angle = 90 ° Obtuse has 1 angle greater than 90 ° Equiangular: has 3 congruent angles (is also acute)
Right, Scalene Triangle
Right, Isosceles Triangle
Triangle Sum Theorem The sum of the measures of the interior angles of a triangle is 180°.B mA + mB +mC = 180° A C
Find m<E in triangle DEF if m<D= 62 degrees and m<F= 39 degrees.
The measures of the angles of the triangle XYZ are in the ratio 2:3:5The measures of the angles of the triangle XYZ are in the ratio 2:3:5. What are the measurements of the angles?
Exterior s (4, 5, and 6) Interior Angles (1, 2, and 3)
Exterior Angle Theoremm<D +m<A =180 B C D A
Find x 95 x 142
Find X x 108 X+2
Homework Page (2-26) evens
TODAY IN GEOMETRY… Review 4.1 concepts Learning Goal: 4.2 Identify Congruent Triangles Independent practice Ch.4 QUIZ-Thursday/Friday.
DO NOW 1) X = 180 2) 55 + X = 180 3) X + 58 = 90 4) 31 + X = 90.
Blue – 2/23/2015 Gold – 2/24/ Name 2 pair of alternate interior angles 5 & 3 and 4 & 1 2. What is the sum of m 1 + m 2 + m 3? 180°
Applying Triangle Sum Properties
HOW MANY SIDES ARE THERE, AND WHAT IS THEIR ANGLE?
Triangles 1 The Basics. 2 Naming Triangles For example, we can call the following triangle: Triangles are named by using its vertices. ∆ABC∆BAC ∆CAB∆CBA∆BCA.
Classify Triangles Standard 4C.
Chapter 4 Congruent Triangles. 4.1 & 4.6 Triangles and Angles Triangle: a figure formed by three segments joining three noncollinear points. Classification.
Lesson 2.1 Classifying Triangles Triangle- a closed figure in a plane that is the union of three segments endpoint to endpoint. Interior Angle- an angle.
Wednesday, September 26, 2012 Homework: p. 185 #31, 34, 43 & 44 (36-42 mentally)
Section 4.1 Classifying Triangles
Geometry. Kinds of triangles Geometry Kinds of triangles.
Classifying Triangles Angle Measures of Triangles.
Warmup – grab a book Room , submit answers for x and y.
Section 3-4: Parallel Lines and the Triangle Angle-Sum Theorem.
Objectives: Classify triangles and find the measures of their angles Use the exterior angles of triangles.
Triangles Geometry Mr. Zampetti Unit 3, Day 1. Today’s Objectives To learn new strategies that will help find the measures of angles in a triangle To.
4-1 Classifying Triangles
Triangle Classification. Objectives Classify triangles by their angle and side measures Find the sum of the measure of the interior and exterior angles.
Classify triangles by sides No congruent sides Scalene triangle At least two sides congruent Isosceles triangle Three congruent sides Equilateral triangle.
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