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Class 7 (Perimeter)Q1) Find the distance covered by Renu in taking 2 rounds of a rectangular park of length 65m and breath 40m .Q2) Find the side of the regular pentagon whose perimeter is 120 cm.Q3) The perimeter of a rectangular field is 236 m if it's length is 64 m .find it's breath.Q4) If 336m of wire is required for fencing square Gardern. Find the side of the garder n.Q5) Find the perimeter of a square whose side is 3x.Q6) The length and breath of a rectangular field are 125m and 75m respectively. Find the cost of fencing it at the rated of RS 5 per metre. |
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Answer»
Q.1 -- Distance covered in 1 ROUND of the rectangular field = 2 ( l+b ) = 2 ( 65 + 40 ) = 2 (105)= 210 mThe distance covered in two ROUNDS = 210 x 2 = 420 m.Q.2 -- Perimeter of regular pentagon = 5a120 = 5a: a = 120/5: a = 24 cmTherefore, the side of the regular pentagon is 24 cmQ.3 -- Let the breadth of rectangular field be 'b'Perimeter of the rectangle = 2( l + b )236 = 2 ( 64 + b)236/2 = 64 + b118 = 64 + bb = 118 - 64: b = 54Therefore, the breadth of the rectangular field is 54 cm.Q.4 -- Length of the wire to be fenced along a square field = 336 m.We all know that the square has four equal sides.Therefore, 336/4 = 82 mTherefore, the side of the square field ( n ) is 82 m.Q.5 -- Side of the square = 3xTherefore, the perimeter of square = 3x x 4= 12x cmQ.6 -- Perimeter of the rectangular field = 2( 125+ 75) = 2( 200 ) = 400 m.Therefore,cost of fencing the GARDEN = 400 x 5= 2000 mHope it helps you.......!
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