P is a 21 sided regular polygon. There are exactly `C(21,3)=1330` triangles whose vertices are ...
868 views · Published 11 October 2018 · 11:23 · Indexed 23 September 2026
Channel: Doubtnut · 2018 · Education
To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW P is a 21 sided regular polygon. There are exactly `C(21,3)=1330` triangles whose vertices are vertices of P. How many of these triangles are (i) acute? (ii) isosceles? (Isosceles include equilateral.)
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