A piece of wire 44cm long is cut into two parts and each part is bent to form a square. If the total area of the two squares is 65cm(sqr) , find the perimeter of the two squares????
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The sides of the squares are S and T
4*S + 4*T = 44...length of wire [1]
S^2 + T^2 = 65...sum of areas [2]
S + T = 11 from [1]
S = 11 - T
(11 - T)^2 + T^2 = 65...substitute for S in [2]
121 - 22*T + 2*T^2 = 65
56 - 22*T + 2*T^2 = 0
T^2 - 11*T + 28 = 0
(T - 7)*(T - 4) = 0
T = 7 or T = 4
So the sides of the squares are 7 and 4 cm
The perimeters of the squares are 4*4 and 4*7 ie 16 and 28 cm <<<
4*S + 4*T = 44...length of wire [1]
S^2 + T^2 = 65...sum of areas [2]
S + T = 11 from [1]
S = 11 - T
(11 - T)^2 + T^2 = 65...substitute for S in [2]
121 - 22*T + 2*T^2 = 65
56 - 22*T + 2*T^2 = 0
T^2 - 11*T + 28 = 0
(T - 7)*(T - 4) = 0
T = 7 or T = 4
So the sides of the squares are 7 and 4 cm
The perimeters of the squares are 4*4 and 4*7 ie 16 and 28 cm <<<
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let x and y be the two sides of two squers x^2+y^2=65, 4x+4y=44 , so x+y=11, y=11-x
x^2+y^2=65 ----(1) put y=11-x we get x^2-11x+28=0 , x=7 or x=4 if x=7 then y=4 and if x=4 then y=7
perimeter of 1 st square is 16cm perimeter of 2 nd square is 26 cm
x^2+y^2=65 ----(1) put y=11-x we get x^2-11x+28=0 , x=7 or x=4 if x=7 then y=4 and if x=4 then y=7
perimeter of 1 st square is 16cm perimeter of 2 nd square is 26 cm
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(x/4)^2 + (11-x/4)^2 = 65
x^2/16+121+x^2/16-22x/4=65
x^2-44x+448 = 0
(x-28)(x-16) = 0
Lengths cut = 28 and 16 cm
Sides of squares are 7 and 4 cm
Perimeters are 28 and 16 cm
x^2/16+121+x^2/16-22x/4=65
x^2-44x+448 = 0
(x-28)(x-16) = 0
Lengths cut = 28 and 16 cm
Sides of squares are 7 and 4 cm
Perimeters are 28 and 16 cm
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Square 1 :4 x 4 = 16
Square 2 : 7 x 7 = 49 16 + 49 = 65
Square 1 : 4 + 4 + 4 + 4 = 16 cm Perimeter
Square 2 : 7 + 7 + 7 + 7 = 28 cm Perimeter 16 + 28 = 44 cm .... Your starting length
Square 2 : 7 x 7 = 49 16 + 49 = 65
Square 1 : 4 + 4 + 4 + 4 = 16 cm Perimeter
Square 2 : 7 + 7 + 7 + 7 = 28 cm Perimeter 16 + 28 = 44 cm .... Your starting length
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Answer :-
Total perimeter = 44 cm;
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Total area = 60.5 sq.cm;
Total perimeter = 44 cm;
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Total area = 60.5 sq.cm;
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5.7cm