Answer: in this picture we know that c + d= 90 degrees. a circle has 360 degrees in total.
Step-by-step explanation:
so firstly we need to do 159+90=249
then we do 360-249=111
we know that 3x =111 degrees
so we then do 111÷3=37
after we find out the angle of d
which can be found by doing
180-111=69 as a straight line has 180 degrees
and we can then use this piece of information to work out c
we just have to do 90-69=21 degrees
