Here's the question you clicked on:
Yumira
Given: ΔABC ≅ ΔFDE What is the length of Segment line DE rounded to the nearest tenth? 5.8 4.2 2.2 3.6
Do you know the distance formula?
For two points, (x1,y1) and (x2,y2) the distance between them is: d = sqrt((x2 - x1)^2 + (y2 - y1)^2) That looks confusing. This looks easier to understand:|dw:1355170387441:dw|
In other words, take the difference between the x values of the two points and square it. Then take the difference between the y values of the two points and square that too. Then add those two squares together and take the square root.
Now look at what you're asked for: the length of DE. Since you know the triangles are congruent, which side in the first triangle corresponds to side DE?