How gravity causes a perfectly spherical ball to roll down an inclined plane is part of the elementary school physics canon.

Area of a Right Triangle = A = 1/2 × Base × Height Area of an Equilateral Triangle = A = (√3)/4 × side 2 ...

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 ...

PAUSE. (A Geogebra file (Geogebra webref) is brought up on the computer in front of Paul. He drags point A, making the triangle look isosceles.) 14:30 P: PAUSE. Oh yes they are! PAUSE ok, must be ...