The area of a regular blackboard is 72 sq cm and its width is 8 cm. How much wooden frame would be neede to enclose the black board from all sides?
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Given :-
- Area of blackboard = 72 cm²
- Width of blackboard = 8 cm
To Find :-
- Perimeter of blackboard
Solution :-
Firstly we have to find length of the blackboard
→ Area of blackboard = L × B
→ 72 = L × 8
→ L = 72/8
→ L = 9 cm
Length of the blackboard is 9 cm . Now we can find perimeter of the blackboard.
→ Perimeter of blackboard = 2 ( L + B )
→ Perimeter = 2 ( 9 + 8 )
→ Perimeter = 2 × 17
→ Perimeter = 34 cm
34 cm wooden frame is needed to enclose the black board from all sside.
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