Problems

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Found: 5

In a parallelogram ABCD, point E belongs to the side CD and point F belongs to the side BC. Show that the total red area is the same as the total blue area:

The triangle visible in the picture is equilateral. The hexagon inside is a regular hexagon. If the area of the whole big triangle is 18, find the area of the small blue triangle.

Which triangle has the largest area? The dots form a regular grid.

The triangle visible in the picture is equilateral. The hexagon inside is a regular hexagon. If the area of the whole big triangle is 18, find the area of the small blue triangle.