Question

Please tell me how to do this. If anyone does they will be marked as brainliest.

Answer 1

Answer:

30° + 45 °+ R = 180° ( angle sum property )

75° + R = 180

R = 180-75

= 105°

It is obtuse angle because one angle is greater than 90°

Answer 2

Answer:

105 degrees and obtuse-angled triangle

Step-by-step explanation:

As all the angles of triangle = 180 deg.

180 - ( 30 + 45) =

180 - 75 =

105

So, 105 deg is an obtuse angle

Thus, it is obtuse-angled triangle