4. Solve (a) The blackboard in Suman's classroom is 3 m long and 1.2 m broad. What is the area of the blackboard? What is its perimeter? find ite breadth and its area.
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Answer: Perimeter is 3x1.2=36
breadth is 12 because l×b=3×x=36
x=36/3=12
area=l×b=3×12=36
area of balckboard=l×b=1.2×12=144sqm
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