4. O is the centre of the two concentric circles shown in the adjoining figure. Use the figure to fill in the blanks:
(iii) $O M$ is the of the .

radius

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inner circle

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Solution

As we can see, $O M$ is the radius of the inner circle.

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Question 4

The diameter of a circle is a line, which joins two points on the circle and also passes through the centre of the circle. (In the adjoining figure AB is a diameter of the circle; C is its centre). Express the diameter of the circle (d) in terms of its radius (r).

Q. In the adjoining figure, PA and PB are tangents drawn from an external point P to a circle with centre O.
Prove that ∠APB = 2∠OAB
Figure

Or, in the adjoining figure, quadrilateral ABCD is circumscribed. If the radius of the incircle with centre O is 10 cm and AD ⊥ DC, find the value of x.
Figure

Q. In the adjoining figure, O is the centre of a circle. Chord CD is parallel to diameter AB. If ∠ABC = 25°, calculate ∠CED.

4. O is the centre of the two concentric circles shown in the adjoining figure. Use the figure to fill in the blanks:

(ii) $O A, O Q, O P$ are ______.

The diameter of a circle is a line which joins two points on the circle and also passed through the centre of the circle. (In the adjoining figure AB is a diameter of the circle; C is its centre.) Express the diameter of the circle (d) in terms of its radius(r).

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4. O is the centre of the two concentric circles shown in the adjoining figure. Use the figure to fill in the blanks:(iii) OM is the ______of the ______.

As we can see, OM is the radius of the inner circle.

4. O is the centre of the two concentric circles shown in the adjoining figure. Use the figure to fill in the blanks:
(iii) $O M$ is the of the .

As we can see, $O M$ is the radius of the inner circle.