Answer:
110 degrees
Step-by-step explanation:
The three angles of any/all triangles should add up to 180
180 - 28 - 42 = 110
1 litre = 1000 millilitres so 1200-200= 1000 millilitres left or 1 litre left
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![Area \:of\: rectangle = l \times b \\ = 3 \times 6 \\ = 18 {cm}^{2}](https://tex.z-dn.net/?f=%20Area%20%5C%3Aof%5C%3A%20rectangle%20%20%3D%20l%20%5Ctimes%20b%20%5C%5C%20%20%3D%203%20%5Ctimes%206%20%5C%5C%20%20%3D%2018%20%7Bcm%7D%5E%7B2%7D%20)
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![Area\: of\: triangle = \frac{ab}{2} \\ = \frac{4 \times 6}{2} \\ = 12 {cm}^{2}](https://tex.z-dn.net/?f=%20Area%5C%3A%20of%5C%3A%20triangle%20%20%3D%20%20%5Cfrac%7Bab%7D%7B2%7D%20%20%5C%5C%20%20%3D%20%20%5Cfrac%7B4%20%5Ctimes%206%7D%7B2%7D%20%20%5C%5C%20%20%3D%2012%20%7Bcm%7D%5E%7B2%7D%20)
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Total area = 12 + 18 = 30cm²