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Copy everything shown and write a two-column proof.

Given:m∠SRT=m∠STR;

m∠3=m∠4

Proof:m∠1=m∠2

Short Answer

Expert verified

Statements

Reasons

1.

Given

2.

2. Angle addition postulate

3.

3. Substitution property

4.

4. Given

5.

5. Subtraction property

Step by step solution

01

Step 1. Angle addition postulate.

From the given figure, it can be observed that sum of m∠1and m∠3gives m∠SRT, that is m∠2+m∠4=m∠STR.

From the given figure, it can be observed that sum of m∠2and m∠4gives m∠STR, that is m∠2+m∠4=m∠STR.

02

Step 2. Apply substitution property.

Substitute m∠1+m∠3for m∠SRTand m∠2+m∠4for in m∠STR.

m∠SRT=m∠STRm∠1+m∠3=m∠2+m∠4

03

Step 3. Apply the subtraction property of algebra.

If a=band c=d, then a−c=b−d.

m∠1=m∠2

04

Step 4. Write a two-column proof.

Write a two-column proof with the help of the above-mentioned steps.

Statements

Reasons

1.m∠SRT=m∠STR

Given

2.m∠1+m∠3=m∠SRT;m∠2+m∠4=m∠STR

2. Angle addition postulate

3.m∠1+m∠3=m∠2+m∠4

3. Substitution property

4.m∠3=m∠4

4. Given

5.m∠1=m∠2

5. Subtraction property

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