Answer:
676π Sq. cm.
Explanation:
The line GY is the radius of the circle with G as center and Y is a point on the circle. 
Now, GY = 10 cm. 
Again, the line XY is the radius of the circle with X as center and Y is a point on the circle. 
Now, XY = 16 cm 
The two circles touched at point Y, 
Therefore, point Y will be on line GX. 
Now, GX = GY + YX = 10 + 16 = 26 cm. 
Therefore, Marco wants to create a new circle using GX as the radius, then the area of the new circle will be π (26)² Sq. cm. = 676π Sq. cm. (Answer)