A
B
C
D
Explanation
Correct answer: B.
Choice B is correct. It's given that measures . Since segments and are parallel, and are congruent. Therefore, measures . The sum of the measures of , , and is since the sum of the interior angles of triangle is equal to . Let the measure of be . Therefore, , which simplifies to . Thus, the measure of is .
Desmos solution:
Note: Since AE is parallel to BD, angle BDC equals angle CEA, then the angles of triangle ACE sum to 180°.
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice A
Choice A is incorrect. This is the measure of , not that of .
Choice C
Choice C is incorrect. This is the measure of , not that of .
Choice D
Choice D is incorrect. This is the sum of the measures of and .