By measuring them with a protractor will confirm that the 3 acute angles of a triangle add up to 180 degrees.
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Yes, because you know two angles so you can extremely easily calculate the third...
A protractor is used for measuring angles and the 3 angles in a triangle add up to 180 degrees.
To solve this, use the fact that the sum of all three angles, in a triangle, is 180 degrees.
Because another triangle could have exactly the same angles, but its sides could all be twice as long, or 62 times as long etc. There are an infinite number of triangles that all have the same two acute angles. They're all similar to each other, but they're not congruent.
If its angles are 45, 45 and 90 degrees then it is an isosceles right angle triangle and its properties can be worked out using Pythagoras' theorem and trigonometry