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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.
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Which expression describes the number of triangles in figure n?
Since there is no figure n, the number of triangles in it is described by the expression 0.
What best describes the English expression two more than the quantity of a number minus seven?
x - 5
Can a isoceles triangle be a polygon?
A polygon is a plane figure bounded by a finite number of straight lines. To enclose an area then a minimum of three straight lines are required. All triangles, not just isosceles triangles, are polygons.
How many number of triangles in a quadrilateral?
Two triangles
How many number of triangles in a pentagon?
3 triangles
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