exam Maths Puzzle Numerical Ability

Find the sum of the measures of the interior angles of a convex polygon with the given number of sides.

Number of sides-->4

Correct answer would really be appreciated:)

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exam Other Question

How do yu solve this by using quadratic formula 2 = 0.7n + 0.6n2?
please show steps. (a) Express 8 Sin theta - 15 Cos theta, in the format: R.Sin(theta + beta)
(b) Using your answer to part (a), solve; 8 Sin theta - 15 Cos theta=8.5 for 0degrees<=theta<=360degrees