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Parallel Lines - Two distinct coplanar lines that do not intersect., Obtuse Angle - An angle that measures more than 90° and less than 180°, Right Angle - A 90° angle., Acute Angle - An angle that measures less than 90°., Triangle - A polygon with three sides., a^2 + b^2 = c^2 - Pythagorean theorem., \pi r^2 - Area of a circle., 2 \pi r - Circumference of a circle., Arc of a circle - A connected section of the circumference of a circle., h \frac{(b_1+b_2)}{2} - Area of trapezium.,

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