Answer :
∠1 and ∠3 are acute angles
∠1 and ∠2 are adjacent angles
∠3 and ∠4 are adjacent angles
∠6 and ∠7 are adjacent angles
∠5, ∠6, ∠7, ∠8, ∠9 are right angles
∠10 and ∠12 are acute angles
∠10 and ∠12 are vertical angles
∠11 and ∠13 are vertical angles
∠10 and ∠11 are adjacent angles
∠10 and ∠13 are adjacent angles
∠11 and ∠12 are adjacent angles
∠13 and ∠12 are adjacent angles
Which of the letters contain at least one acute angle?
A and X
Which contain vertical angles?
X
Which contain adjacent angles?
A, E, and X
