An equilateral triangle fits into its outline three times in a full 360° turn. Image caption, An isosceles triangle has two sides that are equal in length. Isosceles means equal legs. The ‘legs ...

Oh a triangulator machine! Very cool! Right, there are four different types of triangle. First, here's an isosceles triangle, it has two equal length sides and two equal angles. Oh! Very clever!

If you connect Mars with Pollux and Castor, both from the constellation Gemini, you get smaller isosceles triangle, with the Red Planet as the brightest of the three points. This triangle will ...