TrianglesTrianglesBy Christine BergBy Christine Berg

Edited By VTHamiltonEdited By VTHamilton

TrianglesTriangles

Can be classified by the number of congruent sides

Scalene TriangleScalene Triangle

Has no congruent sides

Isosceles TriangleIsosceles Triangle

Has at least two congruent sides

Equilateral TriangleEquilateral Triangle

Has three congruent sides

TrianglesTriangles

Can be classified by the angle

measures

Right TriangleRight Triangle

Has one right angle

Acute TriangleAcute Triangle

Has three acute angles

Obtuse TriangleObtuse TriangleTriangle with one

obtuse angle

TrianglesTriangles

Cut any shape triangle out of a sheet of paper

TrianglesTrianglesTear off the

corners. Piece them together by

having the corners touch.

TrianglesTriangles

The corners form what type of

angle?

TrianglesTriangles

The sum of the angles of a

triangle is 180 degrees

TrianglesTriangles

To find a missing angle, add up the

2 given angles

TrianglesTriangles

Subtract the sum from 180 and you have the missing

angle

Congruent Triangles

Congruent Congruent TrianglesTriangles

Have the same SIZE and the same SHAPE

Congruent Congruent TrianglesTriangles

May be flipped and/or rotated

Congruent Congruent TrianglesTriangles

BE CAREFUL WHEN YOU NAME

THE SHAPE

Congruent Congruent TrianglesTriangles

Name congruent CORRESPONDING

parts (sides and angles)

IN ORDER

Congruent Congruent TrianglesTriangles

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