In the diagram, สามเหลี่ยม and สามเหลี่ยม are similar. Similar figures have the same shape but not necessarily the same size.The symbol means is similar to. In similar triangles, corresponding angles are congruent and corresponding sides are in proportion. The order of the letters indicates the corresponding angles. If สามเหลี่ยมABC คล้ายสามเหลี่ยมFGH, then the following is true.