Two adjacent angles form a resulting angle with measure 160°

. m∠1=3x°
and m∠2=(2x+10)°
. Solve for x
. What are the two unknown angles’ measurements?

1 answer

Since the two angles are adjacent and form a resulting angle of 160°, we can set up the equation:

\[ m∠1 + m∠2 = 160° \]

Substituting in the expressions for the angles:

\[ 3x + (2x + 10) = 160 \]

Now, we can combine like terms:

\[ 3x + 2x + 10 = 160 \]

\[ 5x + 10 = 160 \]

Next, we subtract 10 from both sides:

\[ 5x = 150 \]

Now, divide both sides by 5 to solve for \( x \):

\[ x = 30 \]

Now we can find the measurements of the two angles.

For \( m∠1 \):

\[ m∠1 = 3x = 3(30) = 90° \]

For \( m∠2 \):

\[ m∠2 = 2x + 10 = 2(30) + 10 = 60 + 10 = 70° \]

Thus, the measurements of the two angles are:

\[ m∠1 = 90° \quad \text{and} \quad m∠2 = 70° \]

To verify, we can check if their sum equals 160°:

\[ 90° + 70° = 160° \]

This confirms our solution is correct. The values are:

  • \( m∠1 = 90° \)
  • \( m∠2 = 70° \)