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figure it out! But you can''t figure out N in this equation
25 percent of n = 25% * n = 0.25 * n
Since there is no figure n, the number of triangles in it is described by the expression 0.
The expression that describes the total number of triangles in figure n is n(n+1)(n+2)/6. This can be derived using the formula for calculating the sum of the first n natural numbers, which is n(n+1)/2, and then multiplying it by (n+2)/3 to account for the different possible combinations of vertices in a triangle.
There is no limit to the number of obtuse angles a figure can have. A regular n-gon has n obtuse angles where n is any positive integer greater than 4.