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24.01.2023, solved by verified expert

Mathematics, DAV Post Graduate College

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Answer:

Step-by-step explanation:

According to triangle's sum property, the sum of all angles in a triangle is 180°.

So, for the given triangle,

(7x - 3) + (9x - 1) + 40 = 180

16x - 4 = 140

x = 144/16

Thus, x = 9

So, <A = 7x - 3 = 7(9) - 3 = 60

Therefore, <A = 60°

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