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point a.
If the base of the elevation is at a distance d from the observer, then the highest point is at a height = d*tan(angle of elevation)
The concept of a vertex, which is the intersecting point between two or more geometrical shapes, is meaningless in this case. A point can't have a vertex since it has no shape. A vertex, however can be a point. For example, if one 2-D line intersects another 2-D line, that point of intersection is the vertex.
45
15 = sq rt of (81+144)Distance formula between two points (in the plane): d = √[(x2 - x1)^2 + (y2 - y1)^2]Let A be the point with cordinates (x1, y1), and B the point with coordinates (x2, y2).Substitute the given values into that formula:d = √[(x2 - x1)^2 + (y2 - y1)^2]d = √[(3 - -6)^2 + (-8 - 4)^2]d = √[9^2 + (-12)^2]d = √[81 +144)d = √225d = 15Thus, the distance from point A to point B is 15.