It is divided into two congruent triangles. Congruent means "the same size and shape" The triangles are right-angled with the other 2 angles each being 45 degrees. The sides opposite these 45 degree angles are two of the sides of the original square. If cut out, one triangle would fit exactly over the other one.
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A right angle isosceles triangle is then formed which will have two 45 degrees angles and one 90 degrees angle.
13.2077 cm (12x12) + (12x12)= 288 square root of 288 = 13.2077...
straight
perimeter = 4 x sqrt 72 = 33.94 in area = 72 squinches
a parallelogram does