21. Determine whether the planes are parallel, perpendicular, or neither. If neither, find the cosine of the angle between them. (a) z+ 4y – 3z =1,–3r+ 6y +7z = 0 (b) 2z = 4y – 1, 3r – 12y + 6z = 1 (c) z+y+z=1,1 – y+ z =1

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Angles

In mathematics, angles constitute a very important part. Just like the concept of lines, an angle is a necessary figure that is used for measurement. How do you define its formation? It is formed when two or more lines meet at a point. The point at which two or more lines meet is known as the vertex. When the lines get inclined at this point, they do form various angles. Angles are measured from the vertex in terms of degrees.