If two angles of a triangle are 90∘, 20∘, then what is the third angle?
A
60∘
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B
70∘
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C
90∘
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D
80∘
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Solution
The correct option is B70∘ In a Euclidean space, the sum of measures of these three angles of anytriangle is invariably equal to the straight angle, also expressed as 180o