Math  /  Geometry

Questionse the given information to prove that GEDGFD\triangle G E D \cong \triangle G F D.
Prove: GEDGFD\triangle G E D \cong \triangle G F D Send To Proof Statement Reason
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Studdy Solution

STEP 1

What is this asking? We need to show that two triangles, GED and GFD, are congruent, knowing they share a side and have congruent sides DE and DF. Watch out! Don't assume anything beyond what's given!
We only know *those* two sides are equal, and the shared side.

STEP 2

1. State the givens
2. Establish shared side
3. Use Hypotenuse-Leg Theorem

STEP 3

We are given that DEDFDE \cong DF.
This means the lengths of sides DEDE and DFDF are **equal**.
This is a **key fact** we'll use later!

STEP 4

We're also told that triangles GED and GFD are **right triangles**.
This means they each have a **right angle**, specifically, angles GED and GFD are right angles.

STEP 5

The triangles share the side GDGD.
Because it's the same segment in both triangles, we know GDGDGD \cong GD.
This is called the **reflexive property**!
We now have **two pairs of congruent sides** between the triangles!

STEP 6

In right triangles GED and GFD, sides GE and GF are opposite the right angles.
This makes GE and GF the **hypotenuses** of their respective triangles.

STEP 7

We've shown that the triangles have **congruent legs** (DEDFDE \cong DF) and a **congruent hypotenuse** (GDGDGD \cong GD).
This is precisely what the **Hypotenuse-Leg (HL) Theorem** states!
If two right triangles have congruent hypotenuses and a pair of congruent legs, then the triangles are congruent.

STEP 8

Therefore, by the HL Theorem, we can confidently say GEDGFD\triangle GED \cong \triangle GFD!

STEP 9

We have successfully proven that GEDGFD\triangle GED \cong \triangle GFD using the Hypotenuse-Leg Theorem!

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