1 / 6

Angles In Triangles

Types of Triangles. Scalene triangle. Isosceles triangle. Equilateral Triangle. 3 equal sides 3 equal angles. 2 equal sides 2 equal angles (base). 3 unequal sides 3 unequal angles. Angles In Triangles. Any triangle containing a 90 o angle is a right-angled triangle.

axel
Download Presentation

Angles In Triangles

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. Types of Triangles Scalene triangle Isosceles triangle Equilateral Triangle 3 equal sides 3 equal angles. 2 equal sides 2 equal angles (base) 3 unequal sides 3 unequal angles Angles In Triangles

  2. Any triangle containing a 90o angle is a right-angled triangle An isosceles or a scalene triangle may contain a right angle. Right-angled isosceles triangles. Right-angled scalene triangle.

  3. To determine the angle sum of any Triangle 3 1 2 Angles on a straight line add to 180o How can we use this to help us? Take 3 indentical copies of this triangle like so: These are the same angles as in the triangle! The angle sum of a triangle = 1800

  4. Example 1 65o Calculate angle a. a Example 2 b Calculate angles a, b and c a c Calculating unknown Angles Angle a = 180 – (90 + 65) = 180 – 155 = 25o Since the triangle is equilateral, angles a, b and c are all 60o (180/3)

  5. Example 3 b Calculate angle a. a 65o Example 4 130o y Calculate angles x and y x Calculating unknown Angles Angle a = 65o (base angles of an isosceles triangle are equal). Angle b = 180 –(65 + 65) = 180 – 130 = 50o

  6. Example 5 Calculate angles a and b. a b Example 6 27o Calculate angle a a 15o Calculating unknown Angles Angle a = 180 – (15 + 27) = 180 – 42 = 138o

More Related