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➷ To work it out, you need to know this formula:
area of trapezoid =

'a' is the top side
'b' is the bottom side
'h' is the vertical height
Substitute the values in:
area =

Now solve:
area =

In short, your answer is B.
➶ Hope This Helps You!
➶ Good Luck (:
➶ Have A Great Day ^-^
↬ Hannah ♡