# Lesson 11Stained-Glass Windows

Let’s use circumference and area to design stained glass windows.

### Learning Targets:

- I can apply my understanding of area and circumference of circles to solve more complicated problems.

## 11.1 Cost of a Stained-Glass Window

The students in art class are designing a stained-glass window to hang in the school entryway. The window will be 3 feet tall and 4 feet wide. Here is their design.

They have raised $100 for the project. The colored glass costs $5 per square foot and the clear glass costs $2 per square foot. The material they need to join the pieces of glass together costs 10 cents per foot and the frame around the window costs $4 per foot.

## 11.2 A Bigger Window

A local community member sees the school’s stained glass window and really likes the design. They ask the students to create a larger copy of the window using a scale factor of 3. Would $450 be enough to buy the materials for the larger window? Explain or show your reasoning.

## 11.3 Invent Your Own Design

Draw a stained glass window design that could be made for less than $450. Show your thinking. Organize your work so it can be followed by others.