ABCD is a quadrilateral.
AB||CD
AC||BD
Calculate angle .
We have hundreds of course questions with personalized recommendations + Account 100% premium
ABCD is a quadrilateral.
AB||CD
AC||BD
Calculate angle .
Angles ABC and DCB are alternate angles and equal to 45.
Angles ACB and DBC are alternate angles and equal to 45.
That is, angles B and C together equal 90 degrees.
Now we can calculate angle A, since we know that the sum of the angles of a square is 360:
90°
Indicates which angle is greater
Get unlimited access to all 18 Angles questions, detailed video solutions, and personalized progress tracking.
Unlimited Video Solutions
Step-by-step explanations for every problem
Progress Analytics
Track your mastery across all topics
Ad-Free Learning
Focus on math without distractions
No credit card required • Cancel anytime