To construct a copy of angle ∠XYZ using ray YX as one of the sides of the new angle, after Isha has created the initial arc, the next step he must take is:
He must draw an arc that intersects the larger arc by placing the pointed end on point X.
This will help in determining the correct position for the new angle's other ray, ensuring that the new angle is indeed a double of the original angle ∠XYZ.