A rectangle has vertices A(1, 3), B(1, 10), C(5, 10), and D(5, 3).What is the perimeter of the rectangle?

The polynomial function of least degree with a leading coefficient of 1 is: f(x) = x3 + ax2 + bx + c

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2