## katlin95 2 years ago please help guys! medal rewarded:) Two polygons are similar if: A. Corresponding sides are congruent and corresponding angles are proportional B. Corresponding angles are proportional and corresponding sides are proportional C. Corresponding angles are congruent and corresponding sides are congruent D. Corresponding angles are congruent and corresponding sides are proportional

1. ZakaullahUET

Corresponding angles are congruent and corresponding sides are proportional

2. katlin95

so D right?:)

3. whpalmer4

Congruent means equal, right? Do you agree that for them to be similar, one must be a bigger or smaller version of the other, with the same angles?

4. whpalmer4

congruent angles, in other words

5. ZakaullahUET

congruent means equal but it has a little change meaning, if the figures are placed in same direct then equal if different direction then congrunet

6. katlin95

so do you all agree that its D?

7. whpalmer4

What do *you* think it is? You're the one who needs to know, we already do :-)

8. whpalmer4

Look at those answers, only one of them should make sense as a correct answer.

9. katlin95

I think its D as well!:)

10. whpalmer4

Excellent!

11. whpalmer4

You'll encounter many problems whose solution will require that you understand this, so it's good to look at it and make sure you do.

12. katlin95

yep, it takes time and practice..! lol

13. whpalmer4

One physical model would be if you could copy one of the figures to a sheet of transparent paper, then hold it up in front of the other one. If you can move the paper back and forth (with both sheets being completely parallel) and make the two images perfectly match each other, they are similar. That means the angles must be congruent, and the sides proportional.

14. whpalmer4

Of course the people who write the problems usually make you flip one of the items over in your head, and rotate it, and otherwise make life more difficult :-)