The perimeter of a rectangular plank is 120 cm. If the length is 40cm, find its breadth and surface area of the plank.
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3
Answer:
Step-by-step explanation:
Perimeter = 2 (l + b)
2 (l + b) = 120
2 (40 + b) = 120
40 + b = 60
B = 20 cm.
Area of plank = l × b
= 20 × 40
= 800 cm^2.
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Answered by
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2(l+b)=120
2(40+b)=120
80+2b=120
b=20
area =20×40=800cm square
2(40+b)=120
80+2b=120
b=20
area =20×40=800cm square
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