Triangles

Can be classified by the number of congruent sides Triangles Can be classified by the number of congruent sides

Scalene Triangle Has no congruent sides

Has at least two congruent sides Isosceles Triangle Has at least two congruent sides

Has three congruent sides Equilateral Triangle Has three congruent sides

Can be classified by the angle measures Triangles Can be classified by the angle measures

Right Triangle Has one right angle

Acute Triangle Has three acute angles

Triangle with one obtuse angle Obtuse Triangle Triangle with one obtuse angle

Cut any shape triangle out of a sheet of paper Triangles Cut any shape triangle out of a sheet of paper

Tear off the corners. Piece them together by having the corners touch. Triangles Tear off the corners. Piece them together by having the corners touch.

The corners form what type of angle? Triangles The corners form what type of angle?

The sum of the angles of a triangle is 180 degrees Triangles The sum of the angles of a triangle is 180 degrees

To find a missing angle, add up the 2 given angles Triangles To find a missing angle, add up the 2 given angles

Subtract the sum from 180 and you have the missing angle Triangles Subtract the sum from 180 and you have the missing angle

Congruent Triangles

Have the same SIZE and the same SHAPE Congruent Triangles Have the same SIZE and the same SHAPE

May be flipped and/or rotated Congruent Triangles May be flipped and/or rotated

Congruent Triangles BE CAREFUL WHEN YOU NAME THE SHAPE

Name congruent CORRESPONDING parts Congruent Triangles Name congruent CORRESPONDING parts (sides and angles) IN ORDER

Make sure the letters are in CORRESPONDING order Congruent Triangles Make sure the letters are in CORRESPONDING order

ABC is congruent to DEF B F E D A C

One for you Name the congruent triangles remembering to name the angles in order F E Z D Y X