Q: If angle A plus angle D equals 90 the angle A and angle D are what kind of angles?

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Complementary.

Angle a plus angle b subtract from 180 equals angle c

9 degrees

50 Degrees

plus the angle degrees with the angle complement so equals into 135 degrees

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Complementary.

The angles are supplementary if they have a sum of 180 degrees.

I am pretty sure they would be considered supplimentry angles. m<1+m<2=180 : definition of supplimentry

Angle a plus angle b subtract from 180 equals angle c

120 Since the measures of the angles of supplementary angles add up to 180, 60 plus something else equals 180. 180-60=120

Acute

9 degrees

X = 180 - Y so 180 - Y = 2x + 4 and Y = 4x + 20 so 180 - 4x - 20 = 2x + 4 therefore 6x = 156 so x = 26 making Angle X = 56o and Angle Y = 124o

It is a trapezoid that can have two right angles plus one obtuse angle plus one acute angle and the four angles add up to 360 degrees.

36.64

50 Degrees

All triangles have 3 sides and 3 interior angles that add up to 180 degrees and they are classed as follows:- 1 Scalene triangle has 3 acute angles of different sizes 2 Right angle triangle has a 90 degree angle and 2 acute angles 3 Obtuse triangle has an obtuse angle and 2 acute angles 4 Isosceles triangle has 2 equal angles plus another angle 5 Equilateral triangle has 3 equal 60 degee angles