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Please Identify the congruent triangles in the figure.

What is the missing reason in line 2 of the two-column proof below?

Given: ∠P≅∠M, PQ≅MN, QR≅NO, PR≅MO
Prove: ΔPQR ≅ ΔMNO

Please Identify the congruent triangles in the figure. What is the missing reason-example-1

1 Answer

5 votes

The missing steps are each right angles and
\angle R \cong \angle O.

Solution:

Step 1: Given data:


\overline {P Q} \cong \overline{M N}


\overline{Q R} \cong \overline{N O}


\overline{P R} \cong \overline{M O}

Step 2: In the two polygons,


\angle Q =90^\circ and
\angle N =90^\circ


\angle Q \cong \angle N (Each right angle)

Step 3: Given


\angle P \cong \angle M

Step 4: By third angle theorem,

If two angles in one triangle are congruent to the two angles in the other triangle, then the third angles in the triangles also congruent.


\angle R \cong \angle O

Step 5: By the definition of congruent polygons,

If two same shape polygons have all the angles are congruent and all the corresponding sides are congruent then the polygons are congruent.

Hence
\Delta P Q R \cong \Delta M N O.

Therefore the missing steps are each right angles and
\angle R \cong \angle O.

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