The m<B is 93 degrees, mBC is 58 degrees, and mCD is 106 degrees. Find the missing angle measures. m<A= , m<C=, and m<D =

1 answer

To solve for the missing angle measures \( m\angle A \), \( m\angle C \), and \( m\angle D \), we need to understand the relationships between the angles provided.

  1. Given \( m\angle B = 93^\circ \) and that \( B \) is adjacent to \( C \) and \( D \), we can assume that angles \( A \), \( B \), \( C \), and \( D \) are part of a quadrilateral.

  2. The sum of the angles in a quadrilateral is \( 360^\circ \). Therefore, we can use the equation: \[ m\angle A + m\angle B + m\angle C + m\angle D = 360^\circ \]

  3. We know:

    • \( m\angle B = 93^\circ \)
    • \( m\angle C = 58^\circ \)
    • \( m\angle D = 106^\circ \)
  4. Plugging in the known values: \[ m\angle A + 93^\circ + 58^\circ + 106^\circ = 360^\circ \]

  5. First, calculate the sum of the known angles: \[ 93 + 58 + 106 = 257^\circ \]

  6. Now, substitute this sum back into the equation: \[ m\angle A + 257^\circ = 360^\circ \]

  7. Now, isolate \( m\angle A \): \[ m\angle A = 360^\circ - 257^\circ = 103^\circ \]

Now we have found \( m\angle A \). The angles provided are for \( C \) and \( D \) in the question:

  • \( m\angle A = 103^\circ \)
  • \( m\angle C = 58^\circ \) (provided)
  • \( m\angle D = 106^\circ \) (provided)

Final Answer:

  • \( m\angle A = 103^\circ \)
  • \( m\angle C = 58^\circ \)
  • \( m\angle D = 106^\circ \)