randFromArray([
["in", new Plural(function(num) {
return $.ngettext("inch", "inches", num);
})],
["ft", new Plural(function(num) {
return $.ngettext("foot", "feet", num);
})],
["m", new Plural(function(num) {
return $.ngettext("meter", "meters", num);
})],
["cm", new Plural(function(num) {
return $.ngettext("centimeter", "centimeters", num);
})],
["", new Plural(function(num) {
return $.ngettext("unit", "units", num);
})]
])
randRange(1, 8)
randRange(1, 8)
randRangeNonZero(-2, 2)
B * H
Suppose a parallelogram has base length B \text{ UNIT} and height H \text{ UNIT}.
What is the parallelogram's area?
K
square plural_form(UNIT_TEXT)
graph.p = parallelogram(B, H, UNIT, SH);
graph.p.drawBase();
graph.p.drawHeight();
By moving a slice of the parallelogram, we can see
that its area is equal to that of a rectangle with the
same base and height.
graph.p.sliceHint();
graph.p.animHint();
area of rectangle = b \times h
graph.p.drawArea();
A = B \times H = K