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Which of the following statements is/are true? A: If a circle is formed from a wire, which was initially in the shape of a semi-circle, then ratio of radius of circle and that of semi-circle will be 7: 11. B: If in a semi-circle of radius ‘r’, another semi-circle of radius ‘4r/5’ is drawn, then area of the remaining part of larger semi-circle will be ‘3πr2/5’. C: In a circle of radius ‘r’, if ‘O’ is the center of circle and radii OA and OB are at the angle of 45°, then the length of major arc AB will be ‘7πr/8’.
In the given figure, AB is the diameter of smaller circle and O which is the center of largest circle lies on the smaller circle. If the diameter of the larger circle is 4 units, what is the area of the shaded region ? 
Circle A is 4 cm in diameter; circle B is 5 cm in diameter, Circle C has its circumference equal to the sum of the circumferences of both A and B together, What will be the ratio of the area of circle C, with respect to the area of circle A and circle B respectively? 
Which of the following statements is/are true? A: In a circle, PQ is a chord and OP and OQ are the radii of the circle. If ∠POQ = 90°, then ratio of the area of triangle POQ and that of circle will be 7: 22. B: Area of a circle is one-fourth of the product of ‘π’ and square of diameter of circle. C: Diameter of a semi-circle is 38(8/9)% of its perimeter.
Radius of circle center 0 is 3 times the radius of circle center C. Angle ACB -A angle POQ. If the shaded are of circle C is 2 then what is the area of then shaded part of circleO?
A square land of side 30 m is divided into nine equal square plots of side 9 m and the remaining land (shaded region) is paved as shown below. The area of the shaded region is what percentage of the total area of the square land?
In the figure, circle P has diameter 2 and circle Q has diameter 1. What is the area of the shaded region?
In a rectangular plot of dimensions 60 m × 35 m, four houses (shaded region) were built leaving pathways, as shown in the figure given below. If area of shaded region is 36% of the area of rectangular park, then find the value of x. 
ABCD and PQRS are two squares AB = PQ = 14 cm. There is a circle inscribed in the square ABCD and P, Q, R and S are four quadrants. What is the ratio of shaded region of square ABCD to the shaded region of square PQRS.
The two semi - circle are drawn as shown in the figure. Chord CD is of the length 16 cm is parallel to diameter AB of bigger semi - circle and touches the smaller semi - circle. What is the area of shaded region ?