Assuming you are already sure that the two objects are, indeed, similar: You measure corresponding lengths of the two objects, and divide.You measure the lengths of a pair of corresponding sides. The scale factor is the ratio of the two measures.
You cannot. You can only find a ratio of two or more objects. Then, it can be the ratio of their size, volume, mass, monetary value, temperature - or any other characteristic that can be measured.
The ratio of their heights is 9:4
The ratio of the volumes of similar solids is (the ratio of their linear dimensions)3 .
Notice the exponents in these two statements.Those little tiny numbers tell the whole big story:(the ratio of the surface areas of similar figures) = (the ratio of their linear dimensions)2(the ratio of the volumes of similar solids) = (the ratio of their linear dimensions)3
Assuming you are already sure that the two objects are, indeed, similar: You measure corresponding lengths of the two objects, and divide.You measure the lengths of a pair of corresponding sides. The scale factor is the ratio of the two measures.
You cannot. You can only find a ratio of two or more objects. Then, it can be the ratio of their size, volume, mass, monetary value, temperature - or any other characteristic that can be measured.
The ratio of their heights is 9:4
The ratio of the volumes of similar solids is (the ratio of their linear dimensions)3 .
7:3
Notice the exponents in these two statements.Those little tiny numbers tell the whole big story:(the ratio of the surface areas of similar figures) = (the ratio of their linear dimensions)2(the ratio of the volumes of similar solids) = (the ratio of their linear dimensions)3
Measure any two corresponding edges. The ratio of these edges is the similarity ratio.
You need to find the perimeter of one by adding together the lengths of all its sides. The perimeter of the similar shape is the answer multiplied by the similarity ratio.
Divide any length of any part of one of the objects to the length of the corresponding part of the other object.
Divide the length of a side of one triangle by the length of the corresponding side of the other triangle.
They must have all angles which are the same, all of whose straight lines are in the same ratio and whose curves have radii of curvature in the same ratio.
If you are trying to find the ratio of the lengths of two similar rectangles, divide the length of one side of one rectangle by the corresponding side length of the other rectangle. To find the ratio between their volumes, divide the volume of one rectangle by the volume the other rectangle. To find volume, multiply the width of the rectangle by the length of the rectangle.