a rectangular piece of paper 30 cm long and 21cm wide is taken find the area of the biggest circle that can be cut out from this paper .also find the area of the cutting out the circle ...plz given me xplaination( take pi = 22/7).
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Answered by
14
Biggest size of circle that can be cut off will have the diameter
= the breadth of the paper = 21 cm
radius = 21/2 = 10.5cm
∴ Area of circle = πr² = (22/7)*(10.5)² = 346.5 sqcm
= the breadth of the paper = 21 cm
radius = 21/2 = 10.5cm
∴ Area of circle = πr² = (22/7)*(10.5)² = 346.5 sqcm
shubhangi19032002:
the above ones are absolutely correct.
Answered by
17
The Biggest Circle What Can Be Cut By The Rectangular Piece Of Paper will have diameter = 21cm [as 21 cm is the wide of rectangle so more than that cant be cut]
So Radius Of Circle = Diameter/2
= 21/2 = 10.5cm
Now Area Of The Circle = pi r²
= 22 * 105 * 105
-------------------- [taking decimal out]
7 * 10 * 10
= 346.5 cm²
Area Of Paper Left = Area Of Rectangle - Area of Circle
= 30 * 21 - 346.5
= 630 - 346.5
= 283.5 cm²
Therfore,
Area Of The Circle= 346.5 cm²
Area Of Paper Left= 283.5 cm²
So Radius Of Circle = Diameter/2
= 21/2 = 10.5cm
Now Area Of The Circle = pi r²
= 22 * 105 * 105
-------------------- [taking decimal out]
7 * 10 * 10
= 346.5 cm²
Area Of Paper Left = Area Of Rectangle - Area of Circle
= 30 * 21 - 346.5
= 630 - 346.5
= 283.5 cm²
Therfore,
Area Of The Circle= 346.5 cm²
Area Of Paper Left= 283.5 cm²
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