Ответ:
239. S=a·h·1/2 = 8·4,5/2 = 18
240. S=a·b·1/2 = 6·9/2 = 27
244. S=1/2·a·b·sinα = 4·7·sin30°/2 = 28·1/2·1/2=7
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Ответ:
239. S=a·h·1/2 = 8·4,5/2 = 18
240. S=a·b·1/2 = 6·9/2 = 27
244. S=1/2·a·b·sinα = 4·7·sin30°/2 = 28·1/2·1/2=7