If the 90 angle is added to the 15 degree angle...................the left upper side of the left figure...........the right figure is just the square root of 3 equilateral triangle separated from the figure at the left..............................105...................degrees..................so the other angle has to 75 degrees........................a 3 and a 4..........b/c 3/4 = 0.75.........................half of all single digit primes.................and like 57 degrees in one pi radian.................and 5 + 7 = 12..........like 1/2.......the c. line.......................75 and 60 degrees.................the little triangle on the left lower side...........the 60 degree angle is from the equil triangle...............................and since 75 + 60 = 135............the other angle has to be 45...........degrees...............an old friend by now.......................since complimentary angles are equal....................................two lines crossing.......................have the same angle on opposite sides.................45 degrees.............is the angle of the far left angle on the very bottom triangle....................................since the lowest angle is 90 degrees...........it is one of the 4 angles of the square............the other angle has to be 45.........................so the small triangle..........at the very bottom is a 45/45 right triangle..................................the height of the square root of 3 triangle is 3/2..............................1.5...........like 15 degrees...........fractal patterns.................and the long diagonal of the square root of 2 square is 2.................it is 0.5 to the very bottom tip........0.5 = 1/2.........like the c line..................................