Answer:
do you have an attachment or anything?
Step-by-step explanation:
The square's diagonal is the triangle's hypotenuse.
The Pythagorean theorem is =
Here, 'c' is the hypotenuse and 'a' and 'b' are the two sides of the triangle.
As the side is given 12 inches, so this becomes




inches
60 degrees, because it's an equilateral triangle, as you can tell because the sides are all the same length.