Type of triangle

How do I find the triangle type if the angle ratio is 2:3:7 ?

Result

A =  30 °
B =  45 °
C =  105 °

Solution:

Solution in text A =
Solution in text B =
Solution in text C =

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Math student
Obtuse-angled scalene triangle.

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Following knowledge from mathematics are needed to solve this word math problem:

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