Parallel lines, angles, triangle, sum of angles, alternate interior angles, corresponding angles
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Solve the angles and parallelism exercises to understand the properties of parallel lines and the sum of angles in a triangle. Learn how to calculate angles using the properties of parallel lines and the sum of angles in a triangle.
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[...] Angles and Parallelism Exercise N°1 The lines and are parallel. They are cut by the secant line (rs). The corresponding angles are equal. The angle BAC is 60°. To calculate the angle BAC, we know the measure of the right angle which is 100°. Since we know that two opposite angles measure the same thing, we deduce that the angle BAC is worth 100° - 60°. The angle ABC is 40°. We know that the sum of the angles of a triangle is 180°. [...]
