Area of parallelogram
$val7 ($val16,$val17) , ($val18,$val19) , ($val20,$val21) , ($val22,$val23).
Area of pentagon
$val7
= ($val11,$val12),
= ($val34),
= ($val36),
= ($val37),
= ($val35).
Area of quadrilateral
xrange -15,15 yrange -15,15 arrow -15,0,15,0,10,grey arrow 0,-15,0,15,10,grey linewidth 2 polygon red,$val12,$val13,$val14,$val15,$val16,$val17,$val18,$val19 linewidth 4 points blue,$val12,$val13,$val14,$val15,$val16,$val17,$val18,$val19
$val7
= ($val12,$val13),
= ($val30),
= ($val16,$val17),
= ($val31).
Area of triangle
$val7 ($val16,$val17), ($val18,$val19), ($val20,$val21).
Angle
$val7
,
,
.
$val8
Combination
$(val7[1])
,
.
$(val7[2])
.
Combination 3 vectors
$(val7[1])
,
,
.
$(val7[2])
.
Find combination
$(val7[1;])
,
.
$(val7[2;])
$(val7[3;]):
.
Given scalar products
$(val7[1])
,
.
$(val7[2]):
,
.
$val8
Vertex of parallelogram
$val7
,
,
.
$val8
.
Linear relation
$(val7[1;]):
.
$(val7[2;])
,
$(val7[3;])