Quant-Triangle Calculation

Calculate Triangles:

Sol->

Ans is 27

you can do manually or by formula

n(n+2)(2n+1)/8 if n=even

n(n+2)(2n+1)-1/8 if n=odd

small traingles at the base of big traiangle..

so

n=4

=[4(4+2)(2(4)+1)]/8

=216/8

=27

is the ans.