Circles Review – Fundamentals of Circles, Formulas for Circle, Congruent Circles, Tangent to a circle, Polygon inscribed in a Circle , Circle inscribed in a circle, Concentric Circles
Class Questions – Exercise 1 Exercise 2 Exercise 3 Exercise 4 Exercise 5
Practice Questions – Solutions
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Q.5 In the following figure, the radius of the circle is 9.
Quantity A Quantity B
72 π area of shaded region
A. If Quantity A is greater
B. If Quantity B is greater
C. If Quantity A and Quantity B are equal
D. The relationship cannot be determined from given information
Solution:
Q.6 If the length of a thread is 258 and it is being tied around a circular pole making 20 turns. What could be the nearest possible value of the diameter of a pole from the following?
A. 12.9
B. 12.8
C. 12.3
D. 12.0
E. 11π
Solution;
Number of turns = 20
Length of thread = 258
So,
For 20 of turns, Length of thread = 258
One turn around pole = 1 x 258 / 20
= 12.9
One turn of thread around the pole = Diameter of pole,
i.e. Diameter of pole = 12.9,
The Correct answer is A.