The legs of the piano stand intersect and form two pairs of vertical angles. Vertical angles are formed when two lines intersect. Each opposite pair are called vertical angles and they are congruent. The single red curved lines show a set of vertical angles and the double yellow curved lines show another set of vertical angles. When collapsing the keyboard stand, the angles stay congruent because vertical angles always stay congruent no matter the height. I took this photo of the keyboard in my basement and the legs are used to hold up a piano. Piano falls under the category of music industry.
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