I’m most sure that the answer is A.
Using the distance formula, you can determine the lengths of the sides of the shape. This will help determine if triangles are equilateral, isosceles or scalene; or if quadrilaterals are squares, rectangles, rhombi, or isosceles trapezoids; or if other polygons are regular polygons. The slope formula will tell help you determine if two sides are parallel. In a quadrilateral, this will help you determine if the figure is a parallelogram or a trapezoid.
#4 is a Right angle
#5 is a obtuse angle (greater than right)
# is a Right angle as well
Haven't done this in awhile but i got
63x (2/9-6)
63x (0.2-6)
-364
