Corresponding sides are proportional. This implies that the ratio of the length of side DE to side AB is equal to the ratio of the length of side EF to side BC, and also equal to the ratio of the ...

Once similarity is established, the real fun begins: using proportions to find unknown lengths. The principle is simple: ...

When a shape is enlarged, the image is similar to the original shape. It is the same shape but a different size. These two shapes are similar as they are both rectangles but one is an enlargement of ...

Big Idea – We can describe, measure, and compare spatial relationships. to build on students' knowledge of triangle and develop students' reasoning with properties of different classes of triangles to ...

to build on students' knowledge of triangle and develop students' reasoning with properties of different classes of triangles to develop students' language related to different triangles to engage ...

Everyone learns the number one rule about triangles in high school: the angles of a triangle add up to 180 degrees. But did you know that sometimes they don't? Triangles are much more interesting than ...