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Published byVictoria Riley
Modified over 4 years ago
Triangles By Christine Berg Edited By VTHamilton
Can be classified by the number of congruent sidesTriangles Can be classified by the number of congruent sides
Scalene Triangle Has no congruent sides
Has at least two congruent sidesIsosceles Triangle Has at least two congruent sides
Has three congruent sidesEquilateral Triangle Has three congruent sides
Can be classified by the angle measuresTriangles Can be classified by the angle measures
Right Triangle Has one right angle
Acute Triangle Has three acute angles
Triangle with one obtuse angleObtuse Triangle Triangle with one obtuse angle
Cut any shape triangle out of a sheet of paperTriangles 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 degreesTriangles The sum of the angles of a triangle is 180 degrees
To find a missing angle, add up the 2 given anglesTriangles To find a missing angle, add up the 2 given angles
Subtract the sum from 180 and you have the missing angleTriangles Subtract the sum from 180 and you have the missing angle
Have the same SIZE and the same SHAPECongruent Triangles Have the same SIZE and the same SHAPE
May be flipped and/or rotatedCongruent Triangles May be flipped and/or rotated
Congruent Triangles BE CAREFUL WHEN YOU NAME THE SHAPE
Name congruent CORRESPONDING partsCongruent Triangles Name congruent CORRESPONDING parts (sides and angles) IN ORDER
Make sure the letters are in CORRESPONDING orderCongruent 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
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DO NOW 1) X = 180 2) 55 + X = 180 3) X + 58 = 90 4) 31 + X = 90.
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