# World of TrianglesPage 1

#### WATCH ALL SLIDES

Slide 1 The World Of Triangles

Slide 2 ## Triangles

A triangle is a 3-sided polygon. Every triangle has three sides and three angles. When added together, the three angles equal 180°.

Slide 3 ## Acute Triangles

A triangle in which all three angles are less than 90°.

Slide 4 ## Obtuse Triangles

An obtuse triangle is a triangle in which one of the angles is greater than 90°.

Slide 5 ## Right Triangles

A right triangle is triangle with an angle of 90°.

Slide 6 ## Scalene Triangles

A triangle with three unequal sides.

Slide 7 ## Isosceles Triangles

An isosceles triangle is a triangle with (at least) two equal sides.

Slide 8 ## Isosceles Triangle Theorem

The following movie shows that if two sides of a triangle are congruent, then the angles opposite those sides are congruent.

Slide 9 ## Equilateral Triangles

An equilateral triangle is a triangle with all three sides of equal length.

Slide 10 Equiangular Triangles

An equiangular triangle is a triangle which has three equal angles.

Slide 11 ## Congruent Triangles

Congruent triangles are triangles whose corresponding angles and sides are congruent.

They are exactly the same size and shape.

Slide 12 ## The Hypotenuse

The hypotenuse of a right triangle is the triangle's longest side, i.e., the side opposite the right angle.

Slide 13 ## The Pythagorean Theorem

For a right triangle with legs a and b and hypotenuse c, a2+b2=c2.

Slide 14 ## Triangle Quiz

Please complete the following quiz that covers the information that was just presented to you.

Slide 15 Go to page:
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