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Question

In the diagram above, quadrilateral ABCD is a rhombus. If the m ∠DAB
= 124 °
find the measurements below.

(3 points) answer the questions correclty and tell me why
m∠ABC=

°

m∠AEB=

°

m∠ADE=

°

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1 answer

To solve the angles for quadrilateral ABCD, which is a rhombus, we can use the properties of special quadrilaterals.

  1. Rhombus Properties:
    • In a rhombus, opposite angles are equal and adjacent angles are supplementary (they sum to 180°).

Given that \( m∠DAB = 124° \), we can find the following:

  1. Finding \( m∠ABC \): Since angle DAB and angle ABC are adjacent angles in the rhombus, they are supplementary: \[ m∠ABC = 180° - m∠DAB = 180° - 124° = 56° \]

So, \( m∠ABC = 56° \).

  1. Finding \( m∠AEB \): Point E is the intersection of the diagonals in rhombus ABCD. The diagonals of a rhombus bisect each other at right angles. Thus, triangle AEB will have angles AEB and ABE as:

    We know that \( m∠DAB = 124° \), therefore \( m∠AEB \) can be calculated by recognizing that angle ADB is a straight angle formed by the diagonal. Considering \( m∠DAB = 124° \), \( m∠AEB = \frac{1}{2} \times m∠DAB = \frac{1}{2} \times 124° = 62° \).

So, \( m∠AEB = 62° \).

  1. Finding \( m∠ADE \): In rhombus ABCD, angle DAB is \( 124° \) and angle DAE and DAB share vertex A. Then angle DAE is half of angle DAB because angle ADE is formed where diagonal AC meets diagonal BD. Hence: \[ m∠ADE = \frac{1}{2} \times (m∠DAB) = \frac{1}{2} \times 124° = 62° \]

Thus, \( m∠ADE = 62° \).

Final Measurements:

  • \( m∠ABC = 56° \)
  • \( m∠AEB = 62° \)
  • \( m∠ADE = 62° \)

These calculations are guided by the properties of a rhombus, specifically the bisection of angles by diagonals and the supplementary nature of adjacent angles.