It depends whether you mean 3 is an angle or not
And if it is it is 90 + 180 + 3=273.
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In mathematics, an obtuse angle is defined as an angle greater than 90° and less than 180°. A right angle is 90°. An acute angle is greater than 0°, but less than 90°. Therefore, a 90° right angle plus any acute angle will always fulfill the requirements of an obtuse angle.
Yes in a right angle triangle it does because it is Pythagoras' theorem.
It is the formula for Pythagoras' theorem for right angle triangles.
In a right angle triangle the square of the hypotenuse is equal to height squared plus base squared
That a right angle triangle's base when squared plus its height when squared is equal to its hypotenuse when squared:- a2+b2 = c2