The perimeter of a rectangular plank is 120m . If the length is 40 cm find its breadth and surface area of the plank
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Perimeter = 2×(l + b)
120m = 2×(40+x)
120m = 80 + 2x
2x = 120-80
2x = 40
x = 40/2
x=20cm
breadth = 20cm
Area of rectangle = l×b
40×20= 800m
120m = 2×(40+x)
120m = 80 + 2x
2x = 120-80
2x = 40
x = 40/2
x=20cm
breadth = 20cm
Area of rectangle = l×b
40×20= 800m
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