book Maths Puzzle Numerical Ability

express as the cofunction of a positive acute angle not using a calculator of sin 340 degress.

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book Other Question

AN octagon has eight sides of varying lengths. What is the sum of the measures of its interior angles? Calculate the value of (b� - 4ac) in the equation "9x� + 12x + 16 = 0" and state how many real solutions this equation has. What are they?