Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Zell_2famus

What is the length of DE?

  • 10 months ago
  • 10 months ago

  • This Question is Closed
  1. Zell_2famus
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1372336169264:dw|

    • 10 months ago
  2. phi
    Best Response
    You've already chosen the best response.
    Medals 1

    These triangles are similar (meaning they have the same 3 angles) you know this because the top angle is 40 deg, the two sides are = which means the triangle is isosceles, so its two base angles are equal (both are 70) the angles add up to 180: 40+70+70= 180 I would use proportions (or ratios) base is to side as base is to side 9 is to 12 as x is to 8 you can write that as: 9:12 :: x:8 or as ratios in fraction form: \[ \frac{9}{12}= \frac{x}{8} \] solve for x. one way is to multiply both sides by 8, then simplify

    • 10 months ago
  3. Zell_2famus
    Best Response
    You've already chosen the best response.
    Medals 0

    OK Thanks

    • 10 months ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.