1.

8. If the arcs of the same length in two circles subtend angles 75째 and 120째 atthe centre, find the ratio of their radii.

Answer»

The length of an arc (L) is :

x/360 . 2πr

given L1 = L2

75/360 . 2πr1 = 120/360 . 2πr2

r1/r2 = 8/5



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