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Kissing Triangles

Determine the total shaded area of the 'kissing triangles'.


Prove that a triangle with sides of length 5, 5 and 6 has the same area as a triangle with sides of length 5, 5 and 8. Find other pairs of non-congruent isosceles triangles which have equal areas.


Four rods, two of length a and two of length b, are linked to form a kite. The linkage is moveable so that the angles change. What is the maximum area of the kite?


Age 11 to 14
Challenge Level

A red square and a blue square of side $s$ are overlapping so that the corner of the red square rests on the centre of the blue square.

Show that, whatever the orientation of the red square, it covers a quarter of the blue square.

If the red square is smaller than the blue square what is the smallest length its side can have for your proof to remain true?