Use Pythagoras’ theorem to show a triangle is right-angled or to find one side of a right-angled triangle when two sides are known. Make sure you are confident at substituting into and manipulating ...

Do you think there’s a triangle whose angles measure 41, 76 and 63 degrees? At first, answering this may seem easy. From geometry class we know that the sum of the measures of the interior angles of a ...

The tablet known as Plimpton 322, dated to around 1800 BCE, contains 15 rows of numbers linked to Pythagorean triples (numbers that you could use to draw right triangles). These were not just simple ...