RBSE Solutions Class 6 Maths Chapter 8 Basic Geometrical Concepts and Shapes Exercise 8.4

Question 1. Looking at the figure of the circle, name the following.
Answer:

Based on the figure provided: Radius = OA, OB, or OS
Diameter = AB
Chord = PQ
Center = O
In simple words: Look at the circle to find parts like the center, lines from the center to the edge (radius), lines across the middle (diameter), and any line connecting two points on the edge (chord).
🎯 Exam Tip: Always make sure to use the exact labels given in the diagram when identifying parts of a circle.

Question 2. Say true or false.
(i) Each diameter of a circle is also a chord.
(ii) Every chord of a circle is its diameter as well.
(iii) Two diameters of a circle definitely intersect each other.
(iv) Center of a circle is always at an equal distance from any point on the circumference.
(v) Diameter of a circle is half of its radius.
Answer:
(i) True. A diameter is the longest chord that passes through the center of the circle.
(ii) False. Only chords that pass through the center are diameters. Most chords do not pass through the center.
(iii) True. All diameters of a circle must pass through its center, so they will always intersect at that single point.
(iv) True. This is the definition of a circle; every point on its boundary is the same distance from the center.
(v) False. A diameter is twice the length of its radius.
In simple words: You need to understand what each part of a circle is. A diameter is a special type of chord, but not all chords are diameters. All diameters cross at the middle, and the center is equally far from all edges. A diameter is actually two times the radius, not half.
🎯 Exam Tip: Remember the basic definitions: a chord connects any two points on the circumference; a diameter is a chord passing through the center; and a radius connects the center to a point on the circumference.

Question 4. Draw a circle and mark the following.
(i) Center
(ii) Radius
(iii) Diameter
(iv) An arc
(v) A sector
(vi) A circle segment
Answer:

The requested elements are marked in the diagram above.
(i) Center = O
(ii) Radius = OQ
(iii) Diameter = RS
(iv) An arc = RQ
(v) A sector = ORQ
(vi) A circle segment (shown with chord CT and its corresponding arc)
In simple words: This picture shows a circle with its middle point (center O), a line from the middle to the edge (radius OQ), a line going all the way across through the middle (diameter RS), a curved part of the edge (arc RQ), a pie-slice shape (sector ORQ), and an area made by a straight line and a curved part of the edge (circle segment).
🎯 Exam Tip: When asked to draw and mark, always clearly label each part as specified in the question to ensure full marks.