Q105 of 113 Page 128

In Fig 5.58, PQ, RS and UT are parallel lines.


(i) If c = 570 and a = find the value of d.


(ii) If c = 750 and a = c, find b.

(i) a + b = c


(Given)




⇒ b = 380


d + b = 1800(Co- interior angle)


⇒ d = 1420


(ii) c = 750(Given)


a = c


⇒ a = 300


a + b = c


⇒ b = c - a


⇒ b = (750- 300) = 450


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