Eight. Four for the square base and four more going up to the apex from each corner of the base.
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There are two ways to solve this; Pull one of the matches out slightly of the centre, so that the space between the four matches forms a square.
It's a logical puzzle, make up answere that fit in the open square so it matches the equation on the sides and or bottom.
describe the pattern the square numbers make on the multiplication table
Sqrt of 453664 is 672 and a bit.So next square is 673 squared, ie 452929, so 265 must be added.
A square already has 2 right angle triangles within it