Similarity and congruence

There are 62 NRICH Mathematical resources connected to Similarity and congruence
Placeholder: several colourful numbers
problem

Doubly isosceles

Age
14 to 16
Challenge level
filled star filled star empty star
Find the missing distance in this diagram with two isosceles triangles
Another Triangle in a Triangle
problem

Another triangle in a triangle

Age
16 to 18
Challenge level
filled star filled star empty star
Can you work out the fraction of the original triangle that is covered by the green triangle?