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.
Better Lesson
Better Lesson: Area of Names
Creating names with block letters students calculate area of irregular shapes. This activity also make a real world application to the popular video game Minecraft.
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.
Texas Instruments
Texas Instruments: Give Me a Hand or Leaf Me Alone
In this activity, students' find the surface area of geometric shapes cut from card paper and relate it to its mass. They use this data to find the surface area of irregularly shaped objects.
Better Lesson
Better Lesson: Area of Irregular Polygon
Third graders look for break apart irregular polygons to make arrays to find the area of these common shapes.
Mangahigh
Mangahigh: Shape: Estimate the Area of Shapes
Test your knowledge of determing the area of irregular shapes.
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.
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...
Better Lesson
Better Lesson: Area in Real Life With Irregular Polygons
Dividing an irregular shape into rectangles helps students find the area of an irregular shape.
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...
Sophia Learning
Sophia: Finding the Area of Composite Figures: Lesson 2
This lesson explains how to break composite figures into more simple shapes in order to find its area. It is 2 of 4 in the series titled "Finding the Area of Composite Figures."
Curated OER
University of Georgia: Texas Area Estimate
Drawings and discussion of several methods to estimate the area of an irregular shape, like the state of Texas.
Curated OER
University of Georgia: Texas Area Estimate
Drawings and discussion of several methods to estimate the area of an irregular shape, like the state of Texas.
Curated OER
University of Georgia: Texas Area Estimate
Drawings and discussion of several methods to estimate the area of an irregular shape, like the state of Texas.
Curated OER
University of Georgia: Texas Area Estimate
Drawings and discussion of several methods to estimate the area of an irregular shape, like the state of Texas.
TeachEngineering
Teach Engineering: A Chance at Monte Carlo
At its core, the LEGO MINDSTORMS product provides a programmable microprocessor. Students use the EV3 processor to simulate an experiment involving thousands of uniformly random points placed within a unit square. Using the underlying...
National Council of Teachers of Mathematics
Nctm: Illuminations: Robot Sketcher
Explore this awesome tool that animates a robot that contains sliding arms (like those used in hydraulics) and rotating arms like those used in rotary motors. The exploration asks students to consider how to find the area drawn by the...
Curated OER
Etc: Maps Etc: Drainage on the Laurentian Plateau, 1911
A map from 1911 of a portion of the Laurentian Plateau region of North America showing the drainage and lake network west of Lake Nipigon. The map shows the division line for waters flowing to the Albany and the Winnipeg river systems,...
Curated OER
Educational Technology Clearinghouse: Maps Etc: South China, 1971
"South China comprises the drainage basins of the middle and lower Yangtze River, the basin of the His Chiang (West River) in Kwangtung and Kwangsi; and the mountainous coastal provinces of Fukien and Chekiang. The division between the...
Curated OER
Nova Scotia, New Brunswick, Prince Edward Island, and Newfoundland, 1903
A map from 1903 of the Canadian Maritime Provinces of New Brunswick, Nova Scotia, Prince Edward Island, and an inset of Newfoundland. The map shows province and county borders, rivers, cities, and railroads. "New Brunswick, a province of...