Two adjacent angles, ∠1 and ∠2, form a resulting angle that measures 135°

. If m∠1 = (2x)°
and m∠2 = (2x + 7)°
, what are the two unknown angle measures?

**Hint: Write an equation, combine like-terms, then solve the two step equation.

m∠1 = °

m∠2 = Response area°

1 answer

To find the measures of angles \( \angle 1 \) and \( \angle 2 \), we can use the information given about their measures and the resulting angle.

We know that:

  • \( m\angle 1 = (2x)^\circ \)
  • \( m\angle 2 = (2x + 7)^\circ \)
  • The sum of the two angles is \( 135^\circ \).

We can write the equation as:

\[ m\angle 1 + m\angle 2 = 135^\circ \]

Substituting the expressions for \( m\angle 1 \) and \( m\angle 2 \):

\[ 2x + (2x + 7) = 135 \]

Now, combine like terms:

\[ 2x + 2x + 7 = 135 \]

\[ 4x + 7 = 135 \]

Next, we will isolate \( x \) by first subtracting 7 from both sides:

\[ 4x = 135 - 7 \]

\[ 4x = 128 \]

Now, divide both sides by 4:

\[ x = \frac{128}{4} \]

\[ x = 32 \]

Now that we have the value of \( x \), we can find the measures of the angles:

  1. For \( m\angle 1 \):

\[ m\angle 1 = 2x = 2(32) = 64^\circ \]

  1. For \( m\angle 2 \):

\[ m\angle 2 = 2x + 7 = 2(32) + 7 = 64 + 7 = 71^\circ \]

Thus, the measures of the angles are:

  • \( m\angle 1 = 64^\circ \)
  • \( m\angle 2 = 71^\circ \)

Final Answers:

  • \( m\angle 1 = 64^\circ \)
  • \( m\angle 2 = 71^\circ \)