What is the perimeter of the figure to the nearest tenth of a millimeter? A. 9.4 millimeters

B. 12.0 millimeters

C. 21.4 millimeters

D. 30.8 millimeters

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

Find the equation of the ellipse with the following properties. the ellipse with foci at (0, 6) and (0, -6); y-intercepts (0, 8) and (0, -8).edit: the answer is x^2 over 28 + y^2 over 64 = 1