A figure that has both same size and shape is congruent.
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similarity
They are said to be similar shapes and have the same interior angles.
If they are the same shapes but differ only in size, then they are SIMILAR shapes. Otherwise, they are simply different shapes.
Providing that they have the same angles they are said to be similar shapes
Rocks are not the same because, they come from either a Volcano, or they are broken from the Earth's ground. So this causes it to be different shapes and sizes.