This worksheet is also part of one or more other Books. Modifications will be visible in all these Books. Do you want to modify the original worksheet or create your own copy for this Book instead?
This worksheet was created by '{$1}'. Do you want to modify the original worksheet or create your own copy instead?
This worksheet was created by '{$1}' and you lack the permission to edit it. Do you want to create your own copy instead and add it to the book?
Viviani's Theorem
Observe the sum of the perpendicular distances from a point in or on an equilateral triangle.