Answer:
m∠BCD = 140°
Step-by-step explanation:
ABCD is cyclic quadrilateral. A property of cyclic quadrilateral states that the opposite angles of it sum up to 180°. Here:
m∠A + m∠C =180° and m∠B + m∠D = 180°
So, m∠A + m∠C =180°
m∠A = 40° (given in the question)
40° + m∠C = 180°
m∠C = 180° - 40° = 140°
∴m∠C = m∠BCD = 140°
Answer:look at step by step
Step-by-step explanation:how do I post questions and I’ll help you
Answer:
The answers are 23, 9,200 and 26, 10,400
Step-by-step explanation:
Answer:
C. ∠10
Explanation:
A theorem states that the two angle that are in the same side and are opposite to each other, they add up to 180°, which is supplementary.
What kind of operation is this ? it just says x and a nine.