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Type 1 Area and Perimeter of PlaneFigures1. A rectangular lawn 45 m by 30 m has two roads each3 m wide running in the middle of it, one parallel tolength and the other parallel to breadth. The cost ofgravelling the roads at 90 paise per square metre is(1) 3 194.40(2) 210.20(3) 245.40(4) 162.20(5) None of theserectangular field walking |
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Answer» Answer: Answer REF.Image The cost of GRAVELLING them at Rs. 1.20 per SQUARE METER = Rs . 1560 To find the AREA of roads : It is given that a rectangular lawn 80 m × 60 m has two roads each 10 m wide running in the middle of it. Dimension of two roads are 80×10 and 60×10 Area of two roads = 80×10+60×10−10×10 =800+600−100 = 1300 sq. meter To find the cost for gravelling It is given that The cost of gravelling the at Rs. 1.20 per sq. meter. Therefore total cost = total area × cost per sq. meter =1300×1.20 =Rs.1560 ∴ The cost of gravelling them at Rs. 1.20 per sq. meter = Rs. 1560 solution |
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