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Measure it with a protractor. (If you needed a more mathematical answer with trigonomic functions, you need to state what data you know - i.e length of 2 sides, or length of one side and an angle, what the shape is etc... There is no general method to "how to work out the size of an angle" that works for all shapes.)
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Continue Learning about Geometry
How do you work out an angle size in a triangle?
Measure it with a protractor.
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A congruent angle means an angle of the same size
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An angle bead is a bead worked on or fixed to the angle of any architectural work, for example protecting the angle of a wall.
If angle B 40 degrees and angle A 2x then what is the value of x?
That will depend on the size of the original angle of and what kind of shape it is which has not been given.
Size of interior angle of regular pentagon?
108'
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