Have you ever seen Russian nesting dolls? They were designed as an educational toy, and were first made in Russia, in 1890, by a man named Sava Mamontov. The real name of the dolls sounds like 'Matryoshka', which is a combination of a common girl's name among peasants and the word for 'Mother'. The little dolls look like a peasant mother and her family.

Here are the things you will do in this lesson.

• Determine if two or more triangles are similar
• Determine if two or more regular or irregular polygons are similar
• Explain relationships between side and angle measures of regular and irregular polygons