Interior and Exterior Angles of a Triangle + Perimeter and Area of Triangles + Pythagorean Theorem + Special Right Triangles

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Last updated 2:46 AM on 5/16/26
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8 Terms

1
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The sum of the interior angles of

any triangle is 180 degrees

2
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An exterior angle of a triangle is

equal to the sum of the remote (an angle that is not adjacent to a given exterior angle) interior angles.

3
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There is no special formula for the perimeter of a triangle;

it is just the sum of the lengths of the sides

4
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The area of a triangle is

(1/2)(Base)(Height)

5
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The three exterior angles of any triangle

add up to 360 degrees

6
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Pythagorean Theorem (holds true for all right triangles and for no other triangles)

(Leg1)2 + (Leg2)2 = (Hypotenuse)2

a2 + b2 = c2

7
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45-45-90 triangle

x:x: xsqrt2

<p>x:x: xsqrt2</p>
8
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30-60-90 triangle

x: xsqrt2: 2x

<p>x: xsqrt2: 2x</p>