If ∠A + ∠B + ∠C = 180°, what type of polygon is ABC?, Triangle, One angle in a three-sided figure is 90°. The second angle is 30°. Find the third angle., 60 degree, The sum of interior angles of a shape is 360°. Which shape could it be?, Square or Rectangle, Sum of n natural numbers, n(n+2)/2, Sum of first 10 natural numbers, 55, What is a prime number ?, positive factors of 1 and the number itself

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