Question
Apply properties of quadrilaterals inscribed in a circle to determine the mAD if mQU=55° and mAU=112° , while the m∠UAD=100° .
Answers
Answered by
GPT-4o mini
To solve for \( m \angle ADU \) in a cyclic quadrilateral where the vertices are inscribed in a circle, we can use the properties of inscribed angles and opposite angles.
In a cyclic quadrilateral, the opposite angles are supplementary. Therefore, we have:
\[
m \angle AUD + m \angle UAD = 180°
\]
We are given:
- \( m \angle UAD = 100° \)
Thus,
\[
m \angle AUD = 180° - m \angle UAD = 180° - 100° = 80°
\]
Next, considering the angles in the quadrilateral \( A, U, D, Q \):
1. \( m \angle AUD = 80° \)
2. \( m \angle QU = 55° \)
3. \( m \angle AUQ = 112° \)
Now, we need to find \( m \angle ADU \). In the cyclic quadrilateral \( ADQU \), the angles \( \angle AUQ \) and \( \angle ADU \) are also supplementary, since they are opposite angles:
\[
m \angle AUQ + m \angle ADU = 180°
\]
Substituting the known value of \( m \angle AUQ \):
\[
112° + m \angle ADU = 180°
\]
Now, solving for \( m \angle ADU \):
\[
m \angle ADU = 180° - 112° = 68°
\]
Thus, the measure of \( m \angle ADU \) is:
\[
\boxed{68°}
\]
In a cyclic quadrilateral, the opposite angles are supplementary. Therefore, we have:
\[
m \angle AUD + m \angle UAD = 180°
\]
We are given:
- \( m \angle UAD = 100° \)
Thus,
\[
m \angle AUD = 180° - m \angle UAD = 180° - 100° = 80°
\]
Next, considering the angles in the quadrilateral \( A, U, D, Q \):
1. \( m \angle AUD = 80° \)
2. \( m \angle QU = 55° \)
3. \( m \angle AUQ = 112° \)
Now, we need to find \( m \angle ADU \). In the cyclic quadrilateral \( ADQU \), the angles \( \angle AUQ \) and \( \angle ADU \) are also supplementary, since they are opposite angles:
\[
m \angle AUQ + m \angle ADU = 180°
\]
Substituting the known value of \( m \angle AUQ \):
\[
112° + m \angle ADU = 180°
\]
Now, solving for \( m \angle ADU \):
\[
m \angle ADU = 180° - 112° = 68°
\]
Thus, the measure of \( m \angle ADU \) is:
\[
\boxed{68°}
\]
Answer
Apply properties of quadrilaterals inscribed in a circle to determine the mAD if mQU=55° and mAU=112° , while the m∠UAD=100° .