<Li> R = 2 r (Chapple - Euler) (\ displaystyle \ displaystyle R = 2r \ quad (\ text ((Chapple - Euler)))) </Li> <Li> 9 R 2 = a 2 + b 2 + c 2 (\ displaystyle \ displaystyle 9R ^ (2) = a ^ (2) + b ^ (2) + c ^ (2)) </Li> <Li> r = r a + r b + r c 9 (\ displaystyle \ displaystyle r = (\ frac (r_ (a) + r_ (b) + r_ (c)) (9))) </Li> <Li> r a = r b = r c (\ displaystyle \ displaystyle r_ (a) = r_ (b) = r_ (c)) </Li>

Given an equilateral triangle what kind of symmetry will the figure have point line plane