

Triangles  
P16: Triangles

Bearings  

Gunk the punk!

Show/hide: direction lines bearing protractor 
A radar screen shows the position of 8 planes. The bearing of each plane from the air traffic control centre can be displayed. Click on a plane to show its bearing. Click on either side of a plane to show the direction line. All the direction lines and bearings can be shown or hidden by clicking on the buttons (see left). A protractor can also be displayed. Please note: the direction in which the plane is flying is not shown. 
Angle and rotation, length  
Estimate,
draw and measure angles
Measuring an angle
Measuring length with a ruler

Area and perimeter  
Area and perimeter of a rectangle



Circles  

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