Class 6 Maths NCERT Solutions for Chapter 4 Basic Geometrical Ideas Ex – 4.4

Basic Geometrical Ideas

Question 1.
Draw a rough sketch of a triangle ABC. Mark a point P in its interior and a point Q in its exterior. Is the point A in its exterior or in its interior?

Solution:
Rough sketch of a ∠ABC as shown.
NCERT Solutions for Class 6 Maths Chapter 4 Basic Geometrical Ideas 20
Points P and Q are marked in the interior and exterior of ∆ABC.
Point A lies on the ∆ABC.

Question 2.
(a) Identify three triangles in the figure.
(b) Write the names of seven angles.
(c) Write the names of six line segments.
(d) Which two triangles have ZB as common?
NCERT Solutions for Class 6 Maths Chapter 4 Basic Geometrical Ideas 21
Solution:
(a)
 Three triangles are identified in the figure as ∆ ABC, ∆ ABD and ∆ ACD.
(b) The names of seven angles are ∠BAD, ∠BAC, ∠CAD, ∠ABD, ∠ACD, ∠ADC and ∠ADB.
(c) The names of six line segments are AB, BD, DC, CA, BC and AD.
(d) ∆ ABC and ∆ ABD have ∠B as common.

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