Use the image to answer the question.
An illustration shows the outline of letter upper Y. The vertical rectangular base of the letter has length 7 and width 2. The outward slanting lines measure 12 on the outer side and 7 on the inner side. The thickness of the left slanting line is marked a, and that of the right is marked b. The perpendicular height from the top inner corner angle of the right slant is marked as a dashed line labeled c. The inward extension of the inner side of the left slant line down to the right corner of the rectangular base is marked with a dashed line labeled d.
Which segment would you need to know the length of in order to find the area of the polygon?
(1 point)
Responses
a
a
b
b
d
d
c