Easy way to Measure a Radius

Easy way to Measure a Radius (rounded corner):

Simply place a carpenter's square against the curved outside corner of your spa. The distance from point X (where curve starts) to Y (the crotch of your square) = Radius.

NOTE: The length of the curve itself is not the radius. Measure on the square.

TIP: Don't have a square? Make one from a piece of stiff cardboard.