What is the missing angle?

110°

Step-by-step explanation:

Find the other side of 140

180 - 140 = 40

So the other side of 140° is 40°

Now use this equation

180 - (30 + 40)

Where 180 is the whole degree that the angles of a triangle should add up to, 30 is what we already know and 40 is the one we just found. Add 30 and 40 and subtract that sum by 180

180 - (30 + 40)

180 - 70

110

The missing angle is 110°

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50

this is a 30,40,50 triangle

I hope this is good enough:

so, converting firstly the mixed fractions to improper fractions and then "adding".