Count the number of triangles in the given picture.
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Solution
24 Just to make it easy for you to understand, we have numbered the triangles. So let us start calculating. Ten distinct triangles numbered from 1 to 10. Now, (1+2), (1+2), (1+2+3), (1+2+3+4), (2+3), (2+3+4), (3+4), (5+6), (5+6+7+8), (7+8), (1+2+5+6), (3+4+7+8), (2+6+9), (3+7+10), (6+9), (7+10) and (6+7+9+10). Thus the total number of triangles are 24.