There is a figure given in this question based on classification. Geometric shapes (i.e., circle, triangle, squares, simple lines, rectangle, parallelogram etc.) have to be identified in figure and their total number is to be calculated. If the questions are asked to count the simple lines in the figure, then for counting these lines, dividing them into three parts i.e. the three are counted separately and their sum will be the total number of simple lines. Simple lines should be counted in three separate parts-horizontal line, perpendicular line and slant line.
Example 1. How many triangles are in the given figure?
(a) 16 (b) 15 (c) 9 (d) 7
Solution: (a) Firstly name all the points of the shape.
Example 2. How many triangles are in the following figure?
(a) 18 (b) 28 (c) 20 (d) 24
Solution: (b) Firstly name all the points of the shape.
Therefore, there are 28 triangles in the figure.