Shodor Education Foundation
Shodor Interactivate: Area (Elementary)
In this lesson students will practice finding the area of rectangular shapes and irregular shapes with right angles and understand why the area formula works for rectangular shapes. CCSS.Math.Content.3.MD.C.5.b A plane figure which can...
Shmoop University
Shmoop: Basic Geometry: Area of Irregular Shapes
The geometry resource investigates the area of irregular shapes. Detailed examples and practice exercises are included.
Government of Alberta
Learn Alberta: Math Interactives: Exploring Composite Figures
Investigate how a variety of shapes can be used to form composite figures using this interactive Learn Alberta math resource. Students will also work on using relevant operations and formulas to figure out the total area of composite...
Khan Academy
Khan Academy: Decompose Figures to Find Area 2
Practice decomposing irregular shapes to find their area. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints. CCSS.Math.Content.3.MD.C.7.d Recognize area as additive.
PBS
Pbs Learning Media: Formulas: Targeted Math Instruction
At the end of this lesson plan about formulas, students will be able to identify and apply the correct formula for a given situation, solve for any unknown component of the formulas for perimeter, circumference, and area of regular and...
National Council of Teachers of Mathematics
Nctm: Figure This: Chocolate (Pdf)
Here's a delicious math challenge for chocolate lovers! Use your estimation and measurement skills to discover which irregular shaped, chocolate covered cookie has the largest surface area. A one-page activity from the NCTM Math...
Khan Academy
Khan Academy: Area of Composite Shapes
Practice finding the areas of complex shapes that are composed of smaller shapes. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Illustrative Mathematics
Illustrative Mathematics: G Mg How Many Leaves on a Tree? (Version 2)
In this task, students must estimate the number of leaves on a large tree, taking into account various complex factors such as the area shaded by the tree, the area of irregularly shaped leaves, the uneven distribution of leaves, the...