Save guides, add subjects and pick up where you left off with your BBC account. Two lines have equations \(y = {m_1}x + 3\) and \(y = {m_2}x - 7\). If the lines are parallel then \({m_1} ...

The sum of interior angles in a triangle is 180°. To prove \(a + b + c = 180^\circ\), firstly draw a line parallel to one side of the triangle. \(d = b\) (alternate angles are equal ...

The crows performed better when presented with right angles, parallel lines, or symmetry as opposed to more irregular shapes, displaying a "geometric regularity effect" that emerged without ...