If you know the side lengths, then you can use sin(Θ) = (Opposite)/(Hypotenuse), so Θ = Sin-1(Opposite/Hypotenuse), for example. You could get close to the number of degrees in an angle with a protractor.
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angles that measure 90 degrees.
A Triangle which do not have a right angle.
An acute triangle.
Yes in a 90 45 45 triangle
A right triangle. Also an isosceles triangle.