Q110 of 113 Page 128

In Fig. 5.63, examine whether the following pairs of lines are parallel or not:

(i) EF and GH (ii) AB and CD



Capture.JPG


i) ∠ CQF≠∠ SRD (Alternate Exterior angle)


Hence EF is not || GH


ii) ∠ CQF = ∠ RQF = 650 (Vertically Opposite)


∠ RQF + ∠ SPQ = 1150 + 650 = 1800


Hence they form a pair of corresponding interior angle. So AB || CD


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In Fig. 5.61, l, m and n are parallel lines, and the lines p and q are also parallel. Find the values of a, b and c.

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In Fig. 5.62, state which pair of lines are parallel. Give reason.

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In Fig. 5.64, find out which pair of lines are parallel:

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In Fig. 5.65, show that


(i) AB || CD


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