# Similar triangles

• Sep 11th 2011, 04:41 AM
David Green
Similar triangles
If I have two right angle triangles and two unknown side lengths which I have not yet as apart of the question been asked to calculate or find, but have been asked to show that the two triangles are similar, would somebody please advise what the question means by SHOW.

Thanks

David(Wondering)
• Sep 11th 2011, 05:11 AM
Prove It
Re: Similar triangles
Quote:

Originally Posted by David Green
If I have two right angle triangles and two unknown side lengths which I have not yet as apart of the question been asked to calculate or find, but have been asked to show that the two triangles are similar, would somebody please advise what the question means by SHOW.

Thanks

David(Wondering)

Well, how do you know when two triangles are similar?
• Sep 11th 2011, 05:12 AM
David Green
Re: Similar triangles
Quote:

Originally Posted by Prove It
Well, how do you know when two triangles are similar?

They look similar in appearance, so I am suppose to draw them then?
• Sep 11th 2011, 05:14 AM
Prove It
Re: Similar triangles
Quote:

Originally Posted by David Green
They look similar in appearance, so I am suppose to draw them then?

Absolutely not. There are certain properties about the two triangles which will make them similar. I'm sure if you have been given homework on similar triangles you would have gone over this in class, so check your class notes.
• Sep 11th 2011, 05:14 AM
bjhopper
Re: Similar triangles
Hi David Green,
Show that an acute angle of the first triangle is equal to one in the second triangle
• Sep 11th 2011, 05:24 AM
David Green
Re: Similar triangles
Quote:

Originally Posted by Prove It
Absolutely not. There are certain properties about the two triangles which will make them similar. I'm sure if you have been given homework on similar triangles you would have gone over this in class, so check your class notes.

I have not been given home work on it. Reading the course book does give advise about similar triangles, it explains about the angles being equal which I understand, and it talks about the sides being in proportion to each other, which I understand, then it goes on to show some algebra to proves the lenghts of the sides are in proportion, which I also understand, what I did'nt understand was the explanation of show?

Show by drawing it, show by mathematically working out, show by explanation?

Sometimes questions are not very well worded, which is why I asked for professional second opinions?

Thanks

David
• Sep 11th 2011, 05:25 AM
David Green
Re: Similar triangles
Quote:

Originally Posted by bjhopper
Hi David Green,
Show that an acute angle of the first triangle is equal to one in the second triangle