Answer:
Hi! To find x (the missing angles of the triangles), remember that the angles in a triangle add up to 180 degrees. This means that for each triangle, you can add the two angles given, then subtract that number from 180 to find x. I'll use Triangle 1 as an example:
81 + 84 = 165
180 - 165 = 15
So for Triangle 1, x is equal to 15.
To classify each triangle by angles, remember that an acute triangle has three angles that each measure less than 90 degrees, a right triangle is a triangle with one 90 degree angle, and an obtuse triangle is a triangle with one angle that is greater than 90 degrees. To classify each triangle by sides, remember that scalene triangles have three sides of unequal length, isosceles triangles have two sides of equal length, and equilateral triangles have three sides of equal length.
Keeping all this in mind, here are your answers:
Triangle 1 - 15 acute scalene
Triangle 2 - 120 obtuse scalene
Triangle 3 - 41 right scalene
Triangle 4 - 104 obtuse isosceles
Triangle 5 - 25 right scalene
Triangle 6 - 64 acute scalene
Triangle 7 - 72 acute scalene
Triangle 8 - 32 obtuse scalene
Triangle 9 - 40 right scalene
I hope this helps you! Have a great day. - Mani :)