I need help with the question

As soon as look at the parallelogram abcd shown below: the table below shows the steps to prove that if the quadrilateral abcd is a parallelogram, then its opposite sides are congruent: which choice completes the missing information for reason 5 in the chart? (6 points) congruent parallelograms congruent triangles similar angles similar triangles

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

With finding limits of multi variable !