Which of the following is true for two vertical angles

Question

Which of the following is true for two vertical angles ∠ABC and ∠DBE?

	A)	m∠ABC = m∠DBE
B)	m∠ABC + m∠DBE = 90°
C)	m∠ABC = ½ × m∠DBE
D)	m∠ABC + m∠DBE = 180°

Answer 1

Vertical angles are congruent : option A