If one angle of a triangle is 100 and the other two angles are
equal, what is the measure of
each unknown angle?
(I know nobody has answered this yet..)

40

Step-by-step explanation:

180-100=80÷2=40

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both unknown angles: 40°

Explanation:

total interior angle of the triangle is 180°

solve:

x + x = 100 = 180

2x = 180° - 100°

2x  = 80°

x = 40°

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step-by-step explanation:

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for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.