# Use a calculator to determine upto two decimal places, the perimeter and the area of the circle in the picture. In the given fig, we can see, BC = 3cm and BD = 6cm i. Join CD, thus we obtain a diameter CD. ii. As CBD = 90° ( angle in a semi circle is right angle)

Therefore by Pythagoras theorem

BC2 + BD2 = CD2

32 + 62 = CD2

CD2 = 9 + 36 =45

CD = 3√5

Thus, diameter = CD = 3√5

Radius, iii. Now, change the position of a set square, and draw another diameter to get the center. Thus, A is a centre.

Hence, radius, We need to find perimeter of a circle?

We know that,

Perimeter of a circle = 2πr where r = radius We need to find area of a circle?

We know that,

Area of a circle = π r2 where, r = radius  Rate this question :

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