Maths - Angle Facts

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18 Terms

1
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Acute Angle

Less than 90 degrees

2
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Obtuse angle

Bigger than 90 degrees, less that 180 degrees

3
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Reflex angle

Bigger than 180 degrees

4
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Right angle

exactly 90 degrees

5
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Angles on a line

add up to 180 degrees.

6
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Angles around a point

Add up to 360 degrees.

7
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Angles in a triangle

Add up to 180 degrees.

8
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Isosceles triangle

Two equal angles

9
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Equilateral triangle

three equal angles, each 60 degrees

10
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Angles in a quadrilateral

Add up to 360 degrees

11
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Exterior angles

Add up to 360 degrees

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Interior and exterior angle

add up to 180 degrees

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Sum of interior angles

(Number of sides - 2) x 180

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Vertically opposite angles

Are equal

15
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Alternate angles

Z angle, are the same

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Corresponding angles

F angle, are the same

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Co - interior angles

C angle, add up to 180 degrees.

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How to find the number of sides from the exterior angle

360 divided by one exterior angle