You are Here: Home >< Maths

# Need help with this question ... Watch

1. Stuck on this question ... Anybody can help ... Need working to be shown .. Many thanks in advance
Attached Images

2. (Original post by Saj2830)
Stuck on this question ... Anybody can help ... Need working to be shown .. Many thanks in advance
What sixth form course is this?

Similar triangles is a GCSE topic.
3. Cd/be = ac/bc
4. (Original post by Arithmeticae)
Cd/be = ac/bc
Can you please elaborate .... Thanks
5. (Original post by Saj2830)
Can you please elaborate .... Thanks
How much of an elaboration do you need - in similar triangles the ratio of corresponding sides is the same
6. 21.6/12 = 1.8 = ac / bc

ac / 10 = 1.8

ac= 1.8 x 10 = 18
7. (Original post by TenOfThem)
How much of an elaboration do you need - in similar triangles the ratio of corresponding sides is the same
So ... X = 12.5 cm
8. (Original post by Saj2830)
So ... X = 12.5 cm
No, x = 8

18 - 10 = 8
9. (Original post by Saj2830)
So ... X = 12.5 cm
Not sure where you got that from

Can you see the 2 triangles

What is the enlargement factor from the small triangle to the large one?

Can you apply that to the length of 10 so you get the corresponding length in the large triangle?
10. (Original post by Saj2830)
So ... X = 12.5 cm
No, where did you get that from?

The scale factor between the triangle is 1.8...

Posted from TSR Mobile
11. (Original post by Arithmeticae)

The scale factor between the triangle is 10...
12. (Original post by LouiseR1996)
No, x = 8

18 - 10 = 8
Thank you
13. (Original post by TenOfThem)
Whoops, no idea what happened there. Major typo on my behalf

Posted from TSR Mobile
14. (Original post by Saj2830)
Thank you
Do you understand why?
15. (Original post by TenOfThem)
Do you understand why?
Yes , makes sense now ... Thanks all !!!
16. (Original post by Saj2830)
Yes , makes sense now ... Thanks all !!!
k

that's good then

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: July 3, 2014
Today on TSR

### Degrees to get rich!

... and the ones that won't

### Women equal with Men?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.