Question

Please give me quick Q)3, 4
I mark it birlianist who give me answer.

Answer 1

Consider, the area of the rectangular piece of paper;

area of rectangle = ( length × breadth )

= 25 × 16

= 400 cm² ----( i )

Now, if a quadrant of radius 7 cm is cut from the all four corners then then area occupied by the the four quadrants will be equal to area of a circle ( four quadrants = one complete circle)

Now, area occupied by the four quadrants is equal to the area of circle

Therefore, area of quadrants = pi × r²

= (22÷7) × ( 7 )²

= 22 ÷ 7 × 49

= 22 × 7

= 154 cm²----( ii )

Therefore, the area of the remaining part

= area of. - area of quadrants

rectangle

= 400 - 154 ------ from equation ( i )

and ( ii )

= 246 cm²

Therefore, the area of the remaining part is 246 cm²

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