Question

In a circle ABCD, BAD=30°, ABC=70°. Find BCD​

Answer 1

Answer:

sum of three angles of a triangle

$= 180$

$bad \: = 30$

$abc = 70$

$bad + abc = 30 + 70 = 100$

$100 - 180 = 80$

$bcd = 80$

Answer 2

Answer:

Angle BCD +100=180°

Or, BCD=180-100=80°