H
E
E
L
E
M
E
N
T
S
the five straight lines FG, FH, FK, FL, FM are equal to one another.
Therefore
the circle described with center F and distance one of the straight lines FG, FH, FK, FL, FM will pass also through the remaining points;
and
it will touch the straight lines AB, BC, CD, DE, EA, because the angles at the points G, H, K, L, M are right.
