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Slide 1

The World Of Triangles

Slide 2

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

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

Slide 4

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

Slide 5

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

Slide 6

A triangle with three unequal sides.

Slide 7

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

Slide 8

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

Slide 9

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 are triangles whose corresponding angles and sides are congruent.

They are exactly the same size and shape.

Slide 12

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

Slide 13

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

Slide 14

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

Slide 15

Go to page:

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- Triangles
- Acute Triangles
- Obtuse Triangles
- Right Triangles
- Scalene Triangles
- Isosceles Triangles
- Isosceles Triangle Theorem
- Equilateral Triangles
- Congruent Triangles
- The Hypotenuse
- The Pythagorean Theorem
- Triangle Quiz

- Heat-Energy on the Move
- Radiation
- Newton’s Laws of Motion
- Newton’s law of universal gravitation
- Sound
- Geophysical Concepts, Applications and Limitations
- Newton's Laws

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