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Listed under:  Irregular polygons

### Exploring area and perimeter

Build a compound shape on a grid from shapes such as rectangles, semicircles and squares. Notice that the total area of the compound shape equals the sum of the areas of all of the component shapes. Build a rectangle to produce a given area and perimeter. Identify shapes used to form a compound shape. Calculate the area ...

### Using 'Area and perimeter' - Teacher idea

This Teacher idea relates the experiences of teaching R11472 'Area and perimeter - unit of work' both with students in a regular year 3 class and with others online in a virtual classroom. Through digital resources and hands-on tasks the unit explores the early concepts of perimeter and area, including the introduction ...

### Area and perimeter - unit of work

The unit allows students to explore the beginning concepts of perimeter and area, including the formal units of cm, m, cm sq, and m sq and to learn the differences between these measurements.

### We have it covered - unit of work

This unit allows students to explore the beginning concepts of area, including the formal units of cm, m, cm sq, and m sq.

### Living on the edge - unit of work

This unit allows students to explore the beginning concepts of perimeter, including the formal units of cm and m.

### Let's compare - teacher resource

This teacher resource describes how students can explore the concept of area using the learning objects L139 'Area counting with Coco', L384 'Finding the area of rectangles' and L383 'Finding the area of compound shapes'. Students then use 'Select a measure tool' and maps in the spatial visualisation tool, SpatialGenie, ...

### Starting Smart: how can I use measurement relationships to solve problems? - years 7-9

This curriculum resource package is a ten-week middle years teaching plan and set of supporting resources to extend students' knowledge and skills in the measurement of area and volume and to develop their ability to solve practical measurement problems. Students use counting methods and develop formulas to calculate areas ...

### BBC Bitesize: area - revision

This is a set of illustrated information sheets about the concept of area, and formulas for the calculation of areas of rectangles, triangles, parallelograms and compound shapes. Examples with answers are included and students have access to test questions to assess their learning. This resource is one of a series of online ...

### BBC Bitesize: compound shapes - revision

These illustrated information sheets revise ideas about area of triangles, rectangles, parallelograms and compound shapes. Examples with answers are included and students have access to a multiple-choice test to assess their learning. This is one of a collection of BBC-produced learning objects in the Bitesize series dealing ...

### Area explorer

This is an interactive resource about calculating the area of a shape presented on a grid. Students are presented with a random figure and are required to calculate its area, in square units. Immediate feedback is provided and the student can make repeated attempts if a question is not answered correctly. The additional ...

### Perimeter and area

This is a six-page HTML resource about solving problems with perimeter and area. It contains one video and nine questions, five of which are interactive. The resource discusses and explains solving problems with area and perimeter to reinforce students' understanding.

### Area of composite shapes

Finding the area of a rectangle is quite easy. But what if the shape you're working with is not a simple rectangle? What if it's a composite shape made up of two different-sized rectangles? See how to work out the area, and discover why you need to use the same units.

### Sizing Them Up

This resource is a web page containing a short task to explore area of irregular shapes by informal means. Arrange irregular shapes in size order smallest to largest. This resource is an activity from the NRICH website.

### reSolve: Geometry: Trapezium Pieces

This lesson explores different shapes that can be formed by cutting a trapezium in two with one straight line. Students are challenged to classify and name the shapes that are made, and justify their classifications based on the definitions and properties of shapes. The lesson is outlined in detail including curriculum ...

### reSolve: Authentic Problems: Expanded Square

This sequence of four lessons explores concepts around informal area and symmetry. Students design an 'expanded square' where approximately half the area of the original square is flipped to the outside. The lessons provide opportunities for students to devise and use methods to informally measure area, record their mathematical ...