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Find the area of the figure pictured below.

[Graphs generated by this script: initPicture(-200,210+150,-100,210+100);path([[0,0],[210,0],[250,100],[210,100],[210,200],[0,200],[0,0]]);text([0,100],'20 m','left');text([105,0],'21 m','below');text([230,100],'4 m','aboveright');text([210,150],'10 m','left')]

Area = `m^2`