Adding or subtracting integer multiples of \(2\pi ... right)\) A right angled isosceles triangle has two equal angles of 45°. By taking the two equal side lengths as 1, then by Pythagoras' theorem the ...

For right-angled triangles, Pythagoras Theorem can be used to calculate the length of the third side given the lengths of the other two sides. This is revised in section 16.2. For an equilateral ...