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World of Triangles
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The World Of Triangles

The World Of Triangles

Slide 2

Triangles

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

Acute Triangles

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

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Obtuse Triangles

Obtuse Triangles

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

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Right Triangles

Right Triangles

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

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Scalene Triangles

Scalene Triangles

A triangle with three unequal sides.

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Isosceles Triangles

Isosceles Triangles

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

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Isosceles Triangle Theorem

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

Equilateral Triangles

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

Slide 10

Equiangular Triangles

Equiangular Triangles

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

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Congruent Triangles

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

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

The Pythagorean Theorem

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

Slide 14

Triangle Quiz

Triangle Quiz

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

Slide 15

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