(1/2n-r)2+((n2+2n)/4)
where n is the row number and r is the position of the term in the sequence
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The formula which defines a triangle is: Number of vertices = 3.
to find the area of any triangle follow the formula: 1/2(b*h) "B" - stands for the base of the triangle "H" - stands for the height of the triangle
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the formula is 1side multiply by 3