HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Strona 251

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Arc Length
Returns the length of the arc of a curve between two points on the curve. The curve is an expression, the
independent variable is declared, and the two points are dened by values of the independent variable.
This command can also accept a parametric denition of a curve. In this case, the expression is a list of 2
expressions (the rst for x and the second for y) in terms of a third independent variable.
arcLen(expr, real1, real2)
Examples:
arcLen(x^2, x, –2, 2) returns 9.29….
arcLen({sin(t), cos(t)}, t, 0, π/2) returns 1.57…
Tests
Collinear
Takes a set of points as argument and tests whether or not they are collinear. Returns 1 if the points are
collinear and 0 otherwise.
is_collinear(point1, point2, …, pointn)
Example:
is_collinear(point(0,0), point(5,0), point(6,1)) returns 0
On circle
Takes a set of points as argument and tests if they are all on the same circle. Returns 1 if the points are all on
the same circle and 0 otherwise.
is_concyclic(point1, point2, …, pointn)
Example:
is_concyclic(point(-4,-2), point(-4,2), point(4,-2), point(4,2)) returns 1
On object
Tests whether a point is on a geometric object. Returns a number (1 to n number of sides) representing the
segment that contains the point if it is and 0 otherwise.
is_element(point, object)
Example:
is_element(point(2/√2,2/√2), circle(0,1)) returns 1.
is_element(point(0,-5), square(point(3,3),point(-5,3)) returns 3.
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.
Geometry functions and commands 203
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