© M. Tallman

© M. Tallman

All three sides are congruent.

4 inches

4 inches

4 inches

All three angles are also congruent, 60°.

60° 60°

60°

Note: an equilateral triangle will always have three 60° angles, no matter what the size of the triangle.

© M. Tallman

Two sides are congruent.

4 inches

3 inches

4 inches

Two angles are congruent.

70° 70°

40°

One side has a different length.

One angle is different.

© M. Tallman

All sides are different lengths.

5.5 inches

7 inches

3 inches

All angles are different.

50° 20°

110°

© M. Tallman

Has one right angle.

90°

Note: It is not possible for a triangle to have more than one right angle.

© M. Tallman

All three angles are acute (less than 90°).

50° 60°

70°

© M. Tallman

One angle is obtuse (greater than 90 °) .

110°

Note: It is not possible for a triangle to have more than one obtuse angle.

© M. Tallman

Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.

X°Z°

Y°

a un

its

b units

c units

© M. Tallman

Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.

90°X°

Y°a u

nit

s

b units

c units

© M. Tallman

Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.

X°a

units

a units

a units

X° X°

© M. Tallman

Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.

X°b u

nits b

units

Y° Y°

a units

© M. Tallman

Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.

X°a u

nit

s

a units

X°

b units

© M. Tallman

Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.

Y°

a units

b units

Z° X°

c units

© M. Tallman

Equilateral, Isosceles, Scalene, Right, Acute, Obtuse.

X°

a units

b units

Y°a units

X°