Beside the fact that it looks like a triangle ... how can i prove this....?

2. ## Re: Proof......NEED HELP PLEASE!!!

what does I being the midpoint of GH tell you about HI and GI ?

3. ## Re: Proof......NEED HELP PLEASE!!!

I is the radius on line GH?...

4. ## Re: Proof......NEED HELP PLEASE!!!

In triangles EHI and FGI we have HI congruent to GI, EH congruent to FG and also we have angle EHI congruent to angle FGI. Now recall criterion for congruence of triangles. Thus you have the result.

5. ## Re: Proof......NEED HELP PLEASE!!!

Originally Posted by yeatch
Beside the fact that it looks like a triangle ... how can i prove this....?
You have two congruent triangles.

6. ## Re: Proof......NEED HELP PLEASE!!!

Why are two triangles congruent?

They have equal sides(i.e. one side of a triangle is equal to one side of another triangle) and equal angles.

What is a isosceles triangle?
They have two sides equal. What if two sides are sides of two congruent triangles?

7. ## Re: Proof......NEED HELP PLEASE!!!

Originally Posted by NameIsHidden
Why are two triangles congruent?

They have equal sides(i.e. one side of a triangle is equal to one side of another triangle) and equal angles.

What is a isosceles triangle?
They have two sides equal. What if two sides are sides of two congruent triangles?

two sides and included angle is SAS congruency.EIF is an isosceles triangle EI=IF