Similar Shapes and Similar triangles - Complete explanation with Examples in one shot IGCSE/GCSE

Similar Shapes and Similar triangles, Similarity- IGCSE/GCSE-0580/0606/0607
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In this lesson, you will learn what similar triangles are and how to determine if two triangles are similar. We learn about this topic in geometry, where triangles play a central role, especially right triangles. Two triangles are said to be similar if all three sides are in the same ratio with one another. To determine if the triangles are similar, we compare the corresponding sides and calculate the ratios. If all three ratios are the same, then the triangles are similar.Similar triangles have the same shape because their
matching angles are equal, and their sides are in
proportion (in the same ratio).
Two triangles are similar if they meet one of the following
sets of conditions.
1. All three pairs of matching sides are in the same ratio.
2.Two pairs of matching sides are in the same ratio and the
included angles are equal.
3.Two angles of one triangle equal two angles in the other
triangle.
4. The hypotenuses of two right-angled triangles and another pair
of matching sides are in the same ratio.