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11. The polygons are similar, but not necessarily drawn to scale. Find the value of a and b.

11 The polygons are similar but not necessarily drawn to scale Find the value of a and b class=

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sqdancefan
Corresponding sides have the same ratio.
(2a -5)/25 = 18/30
2a -5 = 25*18/30 = 15
a = (15 +5)/2 = 10

(3b +1)/15 = 30/18
3b +1 = 15*30/18 = 25
b = (25 -1)/3 = 8

a = 10
b = 8

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