# PROOF AND PERPENDICULAR LINES WORKSHEET

## About "Proof and perpendicular lines worksheet"

Proof and perpendicular lines worksheet :

Worksheet given in this section is much useful to the students who would like to practice problems on different types of proofs in geometry and results about perpendicular lines.

## Proof and perpendicular lines worksheet - Problems

Problem 1 :

In the diagram given below,

∠5 and ∠6 are a linear pair

∠6 and ∠7 are a linear pair

Problem 2 :

In the diagram given below, ∠1 and ∠2 are congruent and also a linear pair. Using flow proof, prove that the lines g and h are perpendicular.

Problem 3 :

If two sides of the adjacent acute angles (2x+3)° aaaaaa  and  (4x-6)° are perpendicular, find the value of "x".

Problem 4 :

In the diagram given below, the lines m and n are perpendicular. Find the measures of the angles ∠1, ∠2, ∠3 and ∠4.

## Proof and perpendicular lines worksheet - Solution

Problem 1 :

In the diagram given below,

∠5 and ∠6 are a linear pair

∠6 and ∠7 are a linear pair

Prove ∠5  ∠7 using two-column proof, paragraph proof and flow proof.

Solution :

Two-column Proof :

 Statements ∠5 and ∠6 are a linear pair∠6 and ∠7 are a linear pair∠5 and ∠6 are complementary∠6 and ∠7 are complementary∠5 ≅ ∠7 ReasonsGivenLinear pair postulateCongruence Supplements theorem

Paragraph Proof :

Because ∠5 and ∠6 are a linear pair, the linear pair postulate says that ∠5 and ∠6 are supplementary. The same reasoning shows that ∠6 and ∠7 are supplementary. Because ∠5 and ∠7 are both supplementary to ∠6, the congruent supplements theorem says that ∠5  ∠7.

Flow Proof :

Problem 2 :

In the diagram given below, ∠1 and ∠2 are congruent and also a linear pair. Using flow proof, prove that the lines g and h are perpendicular.

Solution :

Problem 3 :

If two sides of the adjacent acute angles (2x+3)° aaaaaa and  (4x-6)° are perpendicular, find the value of "x".

Solution :

According to result 2, if two sides of two adjacent acute angles are perpendicular, then the angles are complementary.

So, we have

(x+3)° + (2x-6)°  =  90°

x + 3 + 2x - 6  =  90

Simplify.

3x - 3  =  90

Add 3 to both sides.

3x  =  93

Divide both sides by 3.

x  =  31

Problem 4 :

In the diagram given below, the lines m and n are perpendicular. Find the measures of the angles ∠1, ∠2, ∠3 and ∠4.

Solution :

According to result 3, if two lines are perpendicular then they intersect to form four right angles.

So, we have

m∠1  =  90°

m∠2  =  90°

m∠3  =  90°

m∠4  =  90°

After having gone through the stuff given above, we hope that the students would have understood "Proof and perpendicular lines worksheet".

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