A rectangular hall of 15m long and 12m broad is surrounded by a lobby 4m wide find the area of - Maths - Perimeter and Area

Question

A rectangular hall of 15m long and 12m broad is surrounded by a
lobby 4m wide find the area of the lobby

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A rectangular hall of 15m long and 12m broad is surrounded by a lobby 4m wide.find the area of the lobby.