Triangles

problem
Walking round a triangle

Age

5 to 7

Challenge level

This ladybird is taking a walk round a triangle. Can you see how much she has turned when she gets back to where she started?
problem
Calculating with cosines

Age

14 to 18

Challenge level

If I tell you two sides of a right-angled triangle, you can easily work out the third. But what if the angle between the two sides is not a right angle?
problem
Data shapes

Age

5 to 7

Challenge level

Sara and Will were sorting some pictures of shapes on cards. "I'll collect the circles," said Sara. "I'll take the red ones," answered Will. Can you see any cards they would both want?
problem
Sorting logic blocks

Age

5 to 11

Challenge level

This activity focuses on similarities and differences between shapes.
problem
Jig shapes

Age

5 to 11

Challenge level

Can you each work out what shape you have part of on your card? What will the rest of it look like?
problem
Altitude inequalities

Age

14 to 16

Challenge level

Weekly Problem 8 - 2010
Are you able to find triangles such that these five statements are true?
problem
Cutting it out

Age

5 to 11

Challenge level

I cut this square into two different shapes. What can you say about the relationship between them?
problem
Logic block collections

Age

5 to 7

Challenge level

What do you think is the same about these two Logic Blocks? What others do you think go with them in the set?
problem
Animated triangles

Age

5 to 7

Challenge level

Watch this "Notes on a Triangle" film. Can you recreate parts of the film using cut-out triangles?
problem
Triangle relations

Age

7 to 11

Challenge level

What do these two triangles have in common? How are they related?