If `triangleABC` and `trianglePQR` are to be congruent, name one additional pair of corresponding parts. What criterion did you use:

If triangleABC ~= triangleFED under the correspondence ABC harr FED, write all the corresponding congruent parts of the triangle.

A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house. Which method did you use for finding the mean, and why?

State which pairs of triangles in Fig are similar. Write the similarity criterion used by you for answering the question also write the pairs of similar triangles in the symbolic form: