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Uploaded byRobinSom1
PPT, PDF16 views

triangles (1).ppt . This is purely for education purpose

The document discusses the classification of triangles based on the number and measures of congruent sides and angles, describing scalene, isosceles, and equilateral triangles as well as right, acute, and obtuse triangles. It explains how to calculate a missing angle using the sum of angles in a triangle, which is always 180 degrees. Additionally, it covers the concept of congruent triangles, emphasizing the importance of naming corresponding parts in the correct order.

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Triangles Triangles
Triangles Triangles Can be classified by the number of congruent sides
Scalene Triangle Scalene Triangle Has no congruent sides
Isosceles Triangle Isosceles Triangle Has at least two congruent sides
Equilateral Triangle Equilateral Triangle Has three congruent sides
Triangles Triangles Can be classified by the angle measures
Right Triangle Right Triangle Has one right angle
Acute Triangle Acute Triangle Has three acute angles
Obtuse Triangle Obtuse Triangle Triangle with one obtuse angle
Triangles Triangles Cut any shape triangle out of a sheet of paper
Triangles Triangles Tear off the corners. Piece them together by having the corners touch.
Triangles Triangles The corners form what type of angle?
Triangles Triangles The sum of the angles of a triangle is 180 degrees
Triangles Triangles To find a missing angle, add up the 2 given angles
Triangles Triangles Subtract the sum from 180 and you have the missing angle
Congruent Triangles
Congruent Triangles Congruent Triangles Have the same SIZE and the same SHAPE
Congruent Triangles Congruent Triangles May be flipped and/or rotated
Congruent Triangles Congruent Triangles BE CAREFUL WHEN YOU NAME THE SHAPE
Congruent Triangles Congruent Triangles Name congruent CORRESPONDING parts (sides and angles) IN ORDER
Congruent Triangles Congruent Triangles Make sure the letters are in CORRESPONDING order
• ABC is congruent to DEF A B C D E F
One for you • Name the congruent triangles remembering to name the angles in order X Y D E F Z