C
The two triangles are similar — that is, the three angles in triangle EDC correspond to those in ABC
Answer:
the third one
Step-by-step explanation:
search up 30 - 60 - 90 triangle rule for references
-2(4x-1)=5+7
(4x-1)=12/-2
4x=-6+1
x=-5/4
A trapezoid is isosceles if and only if
(1) The base angles are congruent
(2) The diagonals are congruent
(3) The opposite angles are supplementary
So the description does not guarantee that a trapezoid is isoceles for "Congruent bases".
