Use a calculator to determine upto two decimal places, the perimeter and the area of the circle in the picture. Circles

5)Use a calculator to determine upto two decimal places, the perimeter and the area of the circle in the picture.

Answer 

BC = 3cm and BD = 6cm

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 of square , and draw another diameter to get the center 

Thus, A is a centre.

Hence the radius 

Ee 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