Posted by **James** on Wednesday, January 12, 2011 at 12:02pm.

If ∆ ABC ~ ∆ DEF, BC = 12 cm, EF = 10 cm, and AC = 18 cm, find DF.

- Math -
**drwls**, Wednesday, January 12, 2011 at 12:26pm
The triangles are similar (but not congruent).

That means that corresponding sides are all in the same ratio.

BC/EF = 12/10 = AC/DF = 18/DF

DF = 18*(5/6) = 15

- Math -
**helper**, Wednesday, January 12, 2011 at 12:27pm
by ratios

DF/10 = 18/12

solve for DF

- Math -
**Reiny**, Wednesday, January 12, 2011 at 3:50pm
Please do not repost the same question without checking if your last post has been answered.

It causes unnecessary work by the tutors

http://www.jiskha.com/display.cgi?id=1294796964

## Answer this Question

## Related Questions

- Math - How do I determine which two triangles on a graph are congruent. ∆...
- MATH - I entered the wrong coordinates in a previous question, i corrected down ...
- Math Geometry - Geometry Question: Prove the symmetric Property for congruence ...
- Math - Reiny ..thanks for the formula and example. I tried it and i get that ...
- Physics - If ∆Q is the heat supplied to a gas so that the internal energy ...
- Geometry - If ∆ ABC ~ ∆ DEF, BC = 12 cm, EF = 10 cm, and AC = 18 cm...
- Chemistry - Predict the sign of ( ∆H) in each of the following reactions: ...
- science - Predict the sign of ( ∆H) in each of the following reactions: ...
- chemistry - A sample of 1.00 mol H2O(g) is condensed isothermally and reversibly...
- Chemistry - Classify the possible combinations of signs for a reaction's ∆...

More Related Questions