12. Describe the triangles formed by the diagonals of these
quadrilaterals.
a) isosceles trapezoid
b) parallelogram
c) square

a) An isosceles trapezoid is a trapezoid in which the base angles are equal and therefore the left and right side length are also equal.

b) A quadrilateral having it's opposite side equal and parallel is parallelogram.

c) Square is regular quadrilateral which means that it has four equal sides and four equal angles.

b 1: 45 am

step-by-step explanation:

its that because if it was in the pm it would be 1345