Properties of the ratio of areas of triangles

Property1 Ratio of the area of two triangles is equals to the ratio of the product of their corresponding base and height.
Property 2 The ratio of area of two triangles with the same base is equal to the ratio of their corresponding heights.
Property 3 The ratio of two triangles with same height is equal to the ratio of their corresponding base.
Property 4 Area of triangles with the same base and the same height are the same.