and are perpendiculars dropped from to , and is perpendicular to and . If CR = DS, which statement must be true?
m RCD = m SDB ÷ 2
m RCD = m ACD
m RCD = m ACD ÷ 2
m RCD = m ACD ÷ 3
m RCD = m ACD × 2
m RCD = m SDB ÷ 2
m RCD = m ACD
m RCD = m ACD ÷ 2
m RCD = m ACD ÷ 3
m RCD = m ACD × 2