1 / 4

Isosceles Triangles Lesson 3-2

Learn about Isosceles Triangles, base angles, leg-leg theorem, and triangle theorems through practical examples in this lesson.

tludwig
Download Presentation

Isosceles Triangles Lesson 3-2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Isosceles Triangles Lesson 3-2 Lesson 3-2: Isosceles Triangle

  2. 3 Leg Leg Ð 1 and Ð 2 are base angles Ð 3 is the vertex angle 1 2 Base Parts of an Isosceles Triangle • An isosceles triangle is a triangle with two congruent sides. • The congruent sides are called legs and the third side is called the base. Lesson 3-2: Isosceles Triangle

  3. A B C ° 50 ° x Isosceles Triangle Theorems If two sides of a triangle are congruent, then the angles opposite those sides are congruent. Example: Find the value of x. By the Isosceles Triangle Theorem, the third angle must also be x. Therefore, x + x + 50 = 180 2x + 50 = 180 2x = 130 x = 65 Lesson 3-2: Isosceles Triangle

  4. A B C A 3x - 7 x+15 ° ° B 50 50 C Isosceles Triangle Theorems If two angles of a triangle are congruent, then the sides opposite those angles are congruent. Example: Find the value of x. Since two angles are congruent, the sides opposite these angles must be congruent. 3x – 7 = x + 15 2x = 22 X = 11 Lesson 3-2: Isosceles Triangle

More Related