Problem 1 :
In the figure shown below, m∠1 = 105°. Find the measures of the remaining angles.
Problem 2 :
In the figure shown below, m∠2 = 78°. Find the measures of ∠6, ∠10 and ∠14.
Problem 3 :
In the figure shown below, lines m and n are parallel and p is transversal. Find the value of x.
Problem 4 :
In the figure shown below, solve for x.
1. Answer :
In the figure above,
∠1 and ∠2 form a linear pair and they are supplementary.
m∠1 + m∠2 = 180°
105° + m∠2 = 180°
m∠2 = 75°
∠1 and ∠3 are vertical angles and they are equal.
m∠3 = m∠1
m∠3 = 105°
∠2 and ∠4 are vertical angles and they are equal.
m∠4 = m∠2
m∠4 = 75°
∠1 and ∠5 are corresponding angles and they are equal.
m∠5 = m∠1
m∠5 = 105°
∠2 and ∠6 are corresponding angles and they are equal.
m∠6 = m∠2
m∠6 = 75°
∠3 and ∠7 are corresponding angles and they are equal.
m∠7 = m∠3
m∠7 = 105°
∠4 and ∠8 are corresponding angles and they are equal.
m∠8 = m∠4
m∠8 = 75°
2. Answer :
In the figure above, lines m and n are parallel, p and q are parallel.
∠2 and ∠6 are corresponding angles and they are equal.
m∠6 = m∠2
Substitute m∠2 = 78°.
m∠6 = 78°
∠6 and ∠14 are corresponding angles and they are equal.
m∠14 = m∠6
Substitute m∠6 = 78°.
m∠14 = 78°
∠10 and ∠14 are corresponding angles and they are equal.
m∠10 = m∠14
Substitute m∠14 = 78°.
m∠10 = 78°
Therefore,
m∠6 = 78°
m∠10 = 78°
m∠14 = 78°
3. Answer :
In the figure above m and n are parallel and p is transversal. Angles 5x° and (3x + 28)° are corresponding angles and they are equal.
5x° = (3x + 28)°
5x = 3x + 28
Subtract 3x from each side.
2x = 28
Divide each side by 2.
x = 14
4. Answer :
In the figure above, two parallel lines are intersected by another two parallel lines.
y° and 106° are corresponding angles and they are equal.
y° = 106°
(4x + 6)° and y° are corresponding angles and they are equal.
(4x + 6)° = y°
Substitute y° = 106°.
(4x + 6)° = 106°
4x + 6 = 106
Subtract 6 from each side.
4x = 100
Divide each side by 4.
x = 25
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