# Area of triangles Image Source

This student was able to find dozens of triangles with an area of 4 square units using patterns on the geo-board. There are many activities you can try to consolidate your knowledge of area. Try IXL Maths practise, compare area and perimeter of two figures or Mathletics and Rainforest maths. Maths 300 is also an excellent resource for learning about the area of triangles. Click on the green triangle on the desktop of the computers in the pod or the lab to connect to Maths 300 activities.

Using grid paper, create triangles of fixed base and height length (for example, 5cm base and 4cm perpendicular height). Cut out these shapes and try to form squares or rectangles with them, so you can easily calculate the area. You will find that the height of the rectangle formed with the pieces of the triangle is half the height of the original triangle. So, the area of a triangle is equal to half x base x height.

Go to Technomaths to complete the student survey about your Maths learning in Semester 1. I have decided to use another blog for maths posts to keep current work closer to the top of the page. So make sure you bookmark the Technomaths website for future use.

# Perimeter and Area Image Source

Year 6/7 classes have enjoyed having a student teacher, Zac Doherty, over the past couple of weeks. Zac is a past student doing his Graduate Diploma of Education teaching practicum rounds. Students have learnt about measuring length and perimeter and now we are starting to look at area of squares, rectangles, triangles and composite shapes.

Here  is a link to the Learning Federation interactive “Area of triangles“, which shows why we use the formula “the area of a triangle is equal to half the base multiplied by the height”.

This HOTmaths activity is also a great way to learn about area and perimeter. The HOTmaths site has several free activities and links to investigations (in pdf format) suitable for middle years students.

This a simple site for learning more about area and perimeter. Maths Playground has a good explanation of perimeter versus area and some interactive activities for students to learn more. By the end of this unit of work you should be able to do the following:

• Identify, name, measure and draw six different types of angles (acute, right, obtuse, straight, reflex and revolutions)
• Identify, name, measure and draw six types of triangles (acute, right, obtuse, equilateral, isoceles and scalene)
• Identify and name six different quarilaterals (square, rectangle, rhombus, parallelogram, trapezium and kite)
• Identify and draw perpendicular and parallel lines
• Identify and calculate vertically opposite, alternate, corresponding, complementary, supplementary and co-interior  angles.
• Calculate missing angles in triangles and quadrilaterals.
• Accurately draw regular polygons and calculate angles in regular polygons.

Each of the following activities matches with specific learning outcomes.

Acute and Obtuse angles – Guess the random angle

Measuring Angles – What’s my Angle?

Naming and measuring angles – Kidport Measuring Angles

Vertically opposite, corresponding and alternate angles – Exploring relationships of Angles

Types of triangles – sort into Venn diagrams – Sorting Triangles

Angles in a triangle add to 180 degrees – Exploring Angles: Resize a triangle

Calculate  angles using opposite, complementary and supplementary angles – Exploring triangles.

Properties of Quadrilaterals  from BBC KS3 Bitesize

Shape sorter – Exploring Quadrilaterals    Sort shapes based on lines of symmetry – Symmetry Sort

Check out this new tool, Blabberize, where you can upload a photo or image and make it talk, using a recording of your own voice. How do you think we could use it in Maths and Science classes? 