Exercise 21C
Question 1
Fill in the blanks.
(i) All the of a circle are equal.
(ii) The distance around a circle is called
(iii) Any part of a circle is called a/an
(iv) The radius of a circle is of its diameter.
(v) The mid-point of a is the centre of the circle.
Question 2
Write ' $T$ ' for true or ' $F^{\prime}$ ' for false.
(i) The line segment joining two points on a circle is called an arc.
(ii) All diameters are chords.
(iii) A circle has fixed number of radii.
(iv) The area lying between two radii is a tangent.
(v) Twice a circle is a semicircle.
Question 3
From the given figure, identify the following.
<img>
(i) a radius
(ii) a diameter
(iii) a semicircle
(iv) centre
(v) a segment
(vi)a sector
Question 4
$O$ is the centre of the two circles in the figure drawn below. Fill in the blanks for the following.
<img>
(i) $\ldots$ are radii of the inner circle.
(ii) $O P, O B, O A$ are the ......... of the ........ circle.
(iii) $D E$ is a ........ of the ......... circle.
(iv) $A B$ is a ........ of the ........ circle.
(v) The two circles are called ... circles.
(vi) DME is a .....
(vii) ANB is a .....
Multiple Choice Questions (MCQs)
Tick (✔) the correct option in Questions 5 to 9
5. Which of the following is double the radius of the circle?
(a) diameter
(b) arc
(c) segment
(d) sector
6. One-fourth of the region of a circle is
(a) sector
(b) segment
(c) quadrant
(d) none of these
7. Two or more circles with the same centre are called
(a) tangent of circles
(b) concentric circles
(c) segment of circles
(d) none of these
8. Which of the following is not an example of a circle?
(a) one-rupee coin
(b) book
(c) wheel of a cycle
(d) full moon
9. If the radius of a circle is $2 \mathrm{~cm}$, then its diameter is
(a) $2 \mathrm{~cm}$
(b) $3 \mathrm{~cm}$
(c) $4 \mathrm{~cm}$
(d) $6 \mathrm{~cm}$
10. Draw a circle of diameter $6 \mathrm{~cm}$. Mark the centre $O$. Draw a diameter $P Q$ and a radius $O A$. Measure their length and compare them.
11. Mark a point $O$. With centre $O$, draw three circles of radii $3 \mathrm{~cm}, 4 \mathrm{~cm}$ and $5 \mathrm{~cm}$. What type of circles are these?
12. Draw a circle of radius $4.5 \mathrm{~cm}$ and mark any three points $O, A$ and $B$ which contain $A$ in the interior and $B$ in the exterior of the circle.
13. Draw a circle with centre $O$ and radius $6 \mathrm{~cm}$. Draw a sector, a quadrant and secant of the circle.
14. Draw a circle of radius $5 \mathrm{~cm}$. Show minor arc, major arc, minor segment and major segment of the circle. Mark a point.
No comments:
Post a Comment