### Home > GC > Chapter 3 > Lesson 3.2.3 > Problem 3-72

3-72.

Explain why the shapes below are similar.

top edge | ||||||||||

right angle symbol | right angle symbol | |||||||||

interior rectangle | ||||||||||

right angle symbol | right angle symbol |

top edge | ||||

right angle symbol | right angle symbol | |||

interior rectangle | ||||

right angle symbol | right angle symbol |

Use the area and perimeter to find the lengths of the unknown sides. What must be true about these lengths for the rectangles to be similar?