Answer:
Length BC= 17
and AD=7
Step-by-step explanation:
Definition of trapezium
A trapezium is a convex quadrilateral with exactly one set of parallel opposite sides. When sketched on a sheet of paper, the trapezium is a two-dimensional object that looks like a table. A quadrilateral is a polygon with four sides and four vertices in Euclidean geometry. A trapezium has four sides, four angles, and four vertices as a result.
[tex](4x-7+x+1)/2=2x\\x=6[/tex]
now length BC= [tex]4*6-7=17[/tex]
length AD= 6+1=7
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