There are 2 triangles in a square so the ratio to square and triangle is 2 to 1
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area of triangle 1 would be 16 and the other triangle is 9 as the ratio of areas of triangles is the square of their similar sides
Well if you half any quadrilateral it comes up with a triangle and a square is a quadrilateral.
triangles, squares and pentagons.
Draw a rectangle in the ratio of 1:2 eg sides of 5cm & 10cm. Bisect both the longer sides and join their mid points with a straight line. Draw a diagonal. This gives you 2 squares, 2 big triangles and 2 small triangle (1 in each square)
If two triangles are similar, then the reduced ratio of any two corresponding sides is called the scale factor of the similar triangles