Math
Math
Geometry: Area & Surface Area
Calculate area of polygons and surface area of 3D figures by decomposing shapes into rectangles and triangles.
Grade 6-8Intermediate55 min
About This Lesson
In this lesson you'll measure and calculate the area of 2D shapes — and then 'unfold' 3D figures to find their surface area. You'll use these skills to design a real gift box!
Essential Question
How many unit squares fit inside a 5 × 8 rectangle? How would you find the area without counting each square?
Standards
CCSS 6.G.A.1, 6.G.A.4
Learning Objectives
- 1Find the area of triangles, quadrilaterals, and composite shapes
- 2Use nets to visualize and calculate surface area of prisms and pyramids
- 3Solve real-world problems involving area and surface area
Materials Needed
- Grid paper
- Scissors
- Tape
- Pre-cut shape nets
- Rulers
Key Topics
geometryareasurface areapolygons3D shapes