فإن

AINM   هي مساحة الرباعي   A(x)

نص النشاط

A = (3, 3)
B = (13, 3)
C = Rotate(B, 90*°, A)
poly1, c, a, b = Polygon(A, B, C)
k = 9.235 (slider from 0 to 10, step 0.001)
M: (3, 13 - k)
I = Midpoint(c)
d = Line(M, c)
N = Intersect(a, d)
e = Segment(N, I)
poly2, a_1, i, n, m = Polygon(A, I, N, M)
texte2: "إذا كان  x=" + k
f = Segment(C, M)
D = Point(d)
g = true
texte1: "A(x)=" + poly2