Area of Triangles and Composite Polygons

Teaching focus

Area of Triangles and Composite Polygons

Find areas using perpendicular heights and decomposition. Diagrams are not to scale.

Using this activity

Read the supplied material together before independent work. Use the response spaces to show reasoning. For drawing or extended writing, continue on the back if needed.

Reviewing responses

The teacher key includes correct responses or example answers and criteria. Accept other answers when they are supported by the supplied evidence. Observation and personal-response tasks should be checked against the learner's actual work.

Curriculum reference

CCSS candidate: Geometry. This is a candidate domain, not a certified standards mapping.

Versions

This activity has a fixed sequence to keep its context and steps together.