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 ...

Facing due east this week at around 6:30 p.m. local time, we can see an almost perfect isosceles triangle formed by the bright stars marking the heads of Gemini the Twins, Pollux and Castor and ...