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9. Perimeter and Area
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Q68 of 131 Page 226

State whether the statements are True or False.

Ratio of circumference of a circle to its radius is always 2π : 1.

True

We know that, the circumference C of a circle of radius r, is C = 2πr.


On rearranging the terms, we obtain,


⇒ Ratio of circumference of a circle to its radius is always 2π : 1.


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66

State whether the statements are True or False.

In Fig. 9.29 ratio of the area of triangle ABC to the area of triangle ACD is the same as the ratio of base BC of triangle ABC to the base CD of triangle ACD.


67

State whether the statements are True or False.

Triangles having the same base have equal area.

69

State whether the statements are True or False.

5 hectare = 500 m2

70

State whether the statements are True or False.

An increase in perimeter of a figure always increases the area of the figure.

Questions · 131
9. Perimeter and Area
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