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Corresponding, alternate supplementary angles , The trick understanding parallel lines, , supplementary alternate angles. essential maths gcse revision.. https://www.tes.com/teaching-resource/corresponding-alternate-and-supplementary-angles-6393783 Small-angle approximation - wikipedia, The small-angle approximation simplification basic trigonometric functions approximately true limit angle approaches .. https://en.wikipedia.org/wiki/Small-angle_approximation Angles worksheets practice study - math-aids., Geometry worksheets angles worksheets practice study. graphic preview angles worksheets. select variables . http://www.math-aids.com/Geometry/Angles/