How should you classify a closed shape with 5 congruent side lengths? regular pentagon irregular pentagon hexagon pentagon

Which statement justifies why angle ebc measures 90?

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5

The square root of 9x plus 7 plus the square rot of 2x equall to 7