## Reflection: Lesson Planning Area of Compound Shapes - Section 3: Partner Practice

For the Check for Understanding problem, I present students with a figure that does not have all dimensions labeled.  If students split the compound figure horizontally, they will not initially know the length of the base of the larger rectangle.

Some students will encounter this problem, and decide to change the way they split the compound shape.  That's okay!  Some students will reason about the parts and the wholes, and determine that the length is 16 inches.

I include this problem to get a sense of how comfortable students will feel at the start of the next lesson, which is focused on determining unknown lengths.

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# Area of Compound Shapes

Unit 10: Area of Two Dimensional Figures
Lesson 12 of 14

## Big Idea: When a compound shape is decomposed into non-overlapping figures, we can can find and combine the area of each individual shape in order to determine the total area.

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14 teachers like this lesson
Standards:
Subject(s):
Math, area (Measurement), Geometry, square units, dimension, compound figures
65 minutes

### Carla Seeger

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