parallelogram has sides 60 m and 40 m and one of its diagonals is 80 m long then its area is:__________?

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parallelogram has sides 60 m and 40 m and one of its diagonals is 80 m long then its area is:__________?

A. 480 sq.m
B. 320 sq.m
C. 600√15 sq.m
D. 450√15