Understanding composed shapes means recognizing a larger two-dimensional figure as a whole made by joining familiar parts, such as squares, rectangles, triangles, and half- or quarter-circles, and mentally predicting the outline formed when parts are combined or separated. The learner interprets drawings with different orientations and internal boundaries to see how parts fit while preserving their defining attributes; formal area measurement and general geometric transformations are beyond this level.
A composed shape is one large shape made by joining smaller shapes. To understand it:
Example
A square has a triangle joined to its top side:
/\
/ \
/____\
| |
| |
|____|
Step 1: Find the parts.
The bottom part is a square. The top part is a triangle.
Step 2: Notice how they fit.
The bottom of the triangle touches the top of the square.
Step 3: Trace the outside edge.
Start at the bottom-left corner. Trace up the left side, up the slanted side of the triangle, down the other slanted side, down the right side, and along the bottom.
Step 4: Ignore the joining line.
The line between the triangle and square is inside the composed shape, so it is not part of the outside outline.
The two shapes together make one larger shape that looks like a house.
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