Ex-16.1, Circles, Class 9, Maths RD Sharma Solutions | RD Sharma Solutions for Class 9 Mathematics PDF Download

Q1) Fill in the blanks:

(i) All points lying inside/outside a circle are called ______ points/_______ points.

Solution:  Interior/Exterior

(ii) Circle having the same centre and different radii are called _____ circles.

Solution: Concentric

(iii) A point whose distance from the center of a circle is greater than its radius lies in _________ of the circle.

Solution: The Exterior

(iv) A continuous piece of a circle is _______ of the circle.

Solution: Arc

(v) The longest chord of a circle is a ____________ of the circle.

Solution: Diameter

(vi) An arc is a __________ when its ends are the ends of a diameter.

Solution: Semi circle

(vii) Segment of a circle is a region between an arc and _______ of the circle.

Solution: Center

(viii) A circle divides the plane, on which it lies, in _________ parts.

Solution: Three 

Q2) Write the truth value (T/F) of the following with suitable reasons:

(i) A circle is a plane figure.

Solution: T

(ii) Line segment joining the center to any point on the circle is a radius of the circle,

Solution: T

(iii) If a circle is divided into three equal arcs each is a major arc.

Solution: T

(iv) A circle has only finite number of equal chords.

Solution: F

(v) A chord of a circle, which is twice as long as its radius is the diameter of the circle.

Solution: T

(vi) Sector is the region between the chord and its corresponding arc.

Solution: T

(vii) The degree measure of an arc is the complement of the central angle containing the arc.

Solution: F

(viii) The degree measure of a semi-circle is 180⁰.

Solution: T