
this is the index 321
Index
Symbols
∞ (infinity symbol), 298
π (Pi symbol), 214–216
Numbers
3D shapes, volume of, 278–280
3-sided shapes (see triangles)
4-sided shapes (see quadrilaterals; squares)
6-sided shapes (see hexagons)
7-sided shapes (see septagons)
8-sided shapes (see octagons)
9-sided shapes (see nonagons)
A
accurate construction, 108–112
acute angles, 10
acute triangles, 131, 148
adjacent angles, 9
altitude line, 144–145, 148
angles, 3
acute angles, 10
adding, 7–10
adjacent angles, 9
complementary angles, 9–10, 12–13, 47
cutting into smaller angles, 7, 46
equal angles, 30
of equilateral triangles, 176
of parallelograms, 246, 251
of quadrilaterals, adding, 34–37, 46
in regular polygons, 313–314, 318
right angles, 6, 11, 14, 46, 106
spread angle of speakers, 170–172, 174
of straight lines, 11, 46
supplementary angles, 17–18, 47
of triangles, adding, 20–22, 46
of triangles, estimating, 175–180
vertical angles, 19, 22, 47
apothem of regular polygon, 306, 308, 312, 318
arc of circle, 219–222, 234
area
of circles, 223–232, 234, 288, 310
compared to perimeter, 250, 309–310
of congruent triangles, 159
of equilateral triangles, 290–294, 318
of kites, 253–259
of parallelograms, 238–246
of rectangles, 156–162
of regular polygons, 280–282, 284, 302–310, 312, 318
of scalene triangles, 196
of sectors of a circle, 232, 234
of squares, 286
of trapezoids, 260–265
of triangles, 162–167, 202, 290–294
B
ballistics ...