Q90 of 113 Page 128

Iron rods a, b, c, d, e and f are making a design in a bridge as showing Fig. 5.47, in which a ||b, c ||d, e || f. Find the marked angles between


(i) b and c (ii) d and e


(iii) d and f (iv) c and f


Capture.JPG


∠ 1 = 300 (Vertically Opposite angle)


∠4 = 750 (Alternate Interior angle)


∠ 2 + ∠ QPT = 1800 (Co interior angles)


∠ 2 = 1800-750 = 1050


∠ 3 = 750 (Alternate Interior angle)


(i) b and c = ∠ 1 = 300


(ii) d and e = ∠ 2 = 1050


(iii) d and f = ∠ 3 = 750


(iv) c and f = ∠4 = 750


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