float x2 = x1 - r1 * cos(theta1 - 30.0 * SGD_DEGREES_TO_RADIANS);
float y2 = y1 - r1 * sin(theta1 - 30.0 * SGD_DEGREES_TO_RADIANS);
float x3 = x1 - r1 * cos(theta1 + 30.0 * SGD_DEGREES_TO_RADIANS);
float x2 = x1 - r1 * cos(theta1 - 30.0 * SGD_DEGREES_TO_RADIANS);
float y2 = y1 - r1 * sin(theta1 - 30.0 * SGD_DEGREES_TO_RADIANS);
float x3 = x1 - r1 * cos(theta1 + 30.0 * SGD_DEGREES_TO_RADIANS);