3 4
5
Which of the following statements must be true and could be used as part of Katherine's proof? Select ALL that apply.
DA m21 = m_5
B
m 2 = m24
m23 = m24+ m25
IC
Do
DE
m 3 + m24+ m25 = 180°
m21 + m2 + m24+ m25 = 180°