Answer:
i) - 20
ii) - 5
iii) - 55
iv) - 80
Step-by-step explanation:
Ok so all of these angles combined equals 90 since we can see that little right angle symbol down there.
i and ii are both given to us
i = 20
ii = 5
However, iii is an angle not given to us but don't worry we can solve it easily.
So we know that all the angles added up together equals 90, so let's visualize this:
20 + 5 + 10 + BOC =90
35 + BOC =90
BOC = 55
Soooo iii is 55
iv is asking us to find angle AOD and to find that we need to add angles AOB, BOC, and COD
AOB + BOC +COD
20 + 55 + 5
75 + 5
80
aaaaand now we know iv is 80
