Question

,
5. The length of a square is increased by 40% while breadth is decreased by 40%. Find the ratio of the area of the
resulting rectangle se formed to that of the original square.
6. A paper is in the form of a square of side 20 m. Semicircles are drawn inside the
square paper on two sides as diameter. The semicircular portions are cut off (sce
adjoining figure). Find the area of remaining paper. (User3.14)
M M
20 m
7. Two adjacent sides of a parallelogram are 3.2 em and 4 em. What is the ratio of
their altitudes?
The area of a parallelogram is 512 m?. If altitude is twice the corresponding base. A
20 m
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Answer 1

Answer:

5.Let the side of the square be 100 m.

Area of the square = 100×100 sq.m.

In the new dimension of the rectangle.

Length = 140 m. and breadth = 60 m.

Area of the rectangle = 140×60

Ratio = area of the rectanglearea of the squre

140×6010×100=84100=2125 = 21 : 25