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A Rectangular Piece is 20 M Long and 15 M Wide. from Its Four Corners, Quadrants of Radii 3.5 M Have Been Cut. Find the Area of the Remaining Part. - Mathematics

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ConceptIntroduction of Mensuration

Question

A rectangular piece is 20 m long and 15 m wide. From its four corners, quadrants of radii 3.5 m have been cut. Find the area of the remaining part.

Solution

It is given that the length of the rectangular piece is 20 m and its width is 15 m .
And, from each corner a quadrant each of radius 3 . 5 m has been cut out . 
A rough figure for this is given below:

∴ Area of the remaining part = Area of the rectangular piece - (4 x Area of a quadrant of radius 3 . 5m)
Now, area of the rectangular piece = \[20 \times 15 = 300 m^2 \]
And, area of a quadrant with radius \[3 . 5 m =\frac{1}{4} \pi r^2 = \frac{1}{4} \times \frac{22}{7} \times (3 . 5 )^2 \]
\[ = \frac{1}{4} \times \frac{22}{7} \times 3 . 5 \times 3 . 5\]
\[ = 9 . 625 m^2 \]
∴ Area of the remaining part = \[ 300 - (4 \times 9 . 625) = 261 . 5 m^2\]

  Is there an error in this question or solution?

APPEARS IN

 RD Sharma Solution for Mathematics for Class 8 by R D Sharma (2019-2020 Session) (2017 to Current)
Chapter 20: Mensuration - I (Area of a Trapezium and a Polygon)
Ex. 20.1 | Q: 4 | Page no. 13
Solution A Rectangular Piece is 20 M Long and 15 M Wide. from Its Four Corners, Quadrants of Radii 3.5 M Have Been Cut. Find the Area of the Remaining Part. Concept: Introduction of Mensuration.
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