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Chapter 4 Basic Geometrical Ideas Ex 4.4 Solutions

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?

Answer - 1 : -

Triangle ABC is the given triangle.
P is in the interior of ∆ABC.
Q is in the exterior of ∆ABC.
A is neither in the exterior nor in the interior.

Question - 2 : -
(a) Identify three triangles in the figure.
(6) Write the names of seven angles.
(c) Write the names of six line segments.
(d) Which two triangles have ∠B as common?

Answer - 2 : -

(a) Three triangles are: ∆ABC, ∆ABD and ∆ADC.
(b) (i) ∠ABC
(ii) ∠ADB
(iii) ∠BAD
(iv) ∠ADC
(v) ∠ACD
(vi) ∠DAC
(vii) ∠BAC.

(c) The line segments are ,,,,,.

(d) ΔABD and ΔABC


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