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Question
given \\( \triangle wxy \\) is isosceles with legs \\( \overline { wx } \\) and \\( \overline { wy } \\), \\( \triangle wvz \\) is isosceles with legs \\( \overline { wv } \\) and \\( \overline { wz } \\). prove \\( \triangle wxy \sim \triangle wvz \\).
complete the steps of the proof.
| statements | reasons |
|---|---|
| 2 \\( \triangle wvz \\) is isosceles with legs \\( \overline { wv } \\) and \\( \overline { wz } \\) | 2 given |
| 3 \\( \overline { wx } \cong \overline { wy } \\), \\( \overline { wv } \cong \overline { wz } \\) | 3 def of isosceles triangle |
| 4 \\( \diamond \\) | 4 def of \\( \cong \\) |
| 5 \\( ( wz ) ( wx ) = ( wy ) ( wz ) \\) | 5. multiplication property |
| 6 \\( ( wz ) ( wx ) = ( wy ) ( wv ) \\) | 6 \\( \diamond \\) |
| 7 \\( \frac { wy } { wz } = \frac { wx } { wv } \\) | 7 property of proportion |
| 8 \\( \angle w \cong \angle w \\) | 8 reflexive property |
| 9 \\( \triangle wxy \sim \triangle wvz \\) | 9 \\( \diamond \\) |
sas similarity theorem
ssa similarity theorem
sss similarity theorem
ratio
Step1: Definition of congruent segments
Since \( \overline{WX}\cong\overline{WY}\) and \( \overline{WV}\cong\overline{WZ}\), by the definition of congruent segments \( WX = WY\) and \( WV=WZ\).
Step2: Substitution property
In step 5, we have \((WZ)(WX)=(WY)(WZ)\). Since \( WV = WZ\) (from step 3), we can substitute \( WZ\) with \( WV\) in the right - hand side of the equation. So, \((WZ)(WX)=(WY)(WV)\) (by substitution property).
Step3: SAS similarity theorem
We have \(\frac{WY}{WZ}=\frac{WX}{WV}\) (from step 7) and \( \angle W\cong\angle W\) (reflexive property). By the Side - Angle - Side (SAS) similarity theorem, if two sides of one triangle are proportional to two sides of another triangle and the included angles are congruent, then the two triangles are similar.
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- \( WX = WY\) and \( WV = WZ\)
- Substitution property (\( WZ = WV\))
- SAS similarity theorem