HP Prime Graphing NW280AAABA manual Isparallelogram, Isperpendicular, Isrectangle

is_parallel

Tests whether or not two lines are parallel. Returns 1 if they are and 0 otherwise.

is_parallel(line1, line2)

Example:

is_parallel(line(2x+3y=7),line(2x+3y=9) returns 1.

is_parallelogram

Tests whether or not a set of four points are vertices of a parallelogram. Returns 0 if they are not. If they are, then returns 1 if they form only a parallelogram, 2 if they form a rhombus, 3 if they form a rectangle, and 4 if they form a square.

is_parallelogram(point1, point2, point3, point4)

Example:

is_parallelogram(point(0,0), point(2,4), point(0,8), point(-2,4)) returns 2.

is_perpendicular

Similar to is_orthogonal. Tests whether or not two lines are perpendicular.

is_perpendicular(line1, line2)

is_rectangle

Tests whether or not a set of four points are vertices of a rectangle. Returns 0 if they are not, 1 if they are, and 2 if they are vertices of a square.

is_rectangle(point1, point2, point3, point4)

Examples:

is_rectangle(point(0,0), point(4,2), point(2,6), point(-2,4)) returns 2.

With a set of only three points as argument, tests whether or not they are vertices of a right triangle. Returns 0 if they are not. If they are, returns the number order of the common point of the two perpendicular sides (1, 2, or 3).

is_rectangle(point(0,0), point(4,2), point(2,6)) returns 2.

188 Geometry