# 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

iii. Now, change the position of a set square, and draw another diameter to get the center.

Thus, A is a centre.

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 :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Quiz | Imp. Qs. on Circle35 mins
Quiz | Imp. Qs. on Circles37 mins
Quiz | Testing Your Knowledge on Circles32 mins
Short Cut Trick to Find Area of Triangle43 mins
Quiz | Areas Related to Circles43 mins
RD Sharma | Area of Sector and Segments25 mins
Quiz | Area Related with Circles47 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses