There should be a

(distance to x:() y:()::sensing)

block.
This would be useful, and even though there are workarounds, they are either too hard for beginers,
or use multiple sprites or variables. This block would return the distance from the center of the sprite
to the specified x and y position.

this can be achieved with some maths:

([sqrt v] of ((([y] - (y position)) * ([y] - (y position))) + (([x] - (x position)) * ([x] - (x position)))))

you dont need extra variables or sprites.