O'Reilly logo

Head First 2D Geometry by Dawn Griffiths, Stray

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

the index
perimeter of (see perimeter)
scaling (see scaling shapes)
similar (see similar shapes)
(see also specific shapes)
shooting example (see homicide example)
similar shapes, 58–63, 67, 77, 89, 100
proportional scaling of, 73–76
ratios for, 92–98
right triangles and, 120–122
(see also scaling shapes)
6-sided shapes (see hexagons)
skate ramp example, 104–147
multiple ramps, 132–135
perpendicular uprights, 106–131
rope swing, 139–147
sketches (see drawings)
speakers example, 170–180
spread angle of speakers, 170–172, 174
squares, 268
area of, 286
perimeter of, 286–287
similarity of, 77, 100
(see also quadrilaterals; regular polygons)
straight lines (see lines)
Super Triangles (Pythagorean triples), 146, 148
supplementary angles, 17–18, 47
T
3-sided shapes (see triangles)
3D shapes, volume of, 278–280
trapeziums, 270
trapezoids, 262, 267, 269, 272
area of, 260–265
bases of, 262
compared to parallelograms, 270
isosceles trapezoids, 267, 269
triangles
altitude line for, 144–145, 148
angles of, adding, 20–22, 46
angles of, estimating, 175–180
area of, 162–167, 202, 290–294
bisecting, 144–146
bounding rectangle for, 157–163
centers of, 181–188
equilateral triangles, 176, 188, 290–294, 318
hypotenuse of, 131, 138
isosceles triangles, 144–145, 175–180, 269
legs of, 131, 138, 141
medians of, 182, 202
perimeter of, 294
right triangles (see right triangles)
scalene triangles, 194–198
similar triangles, 58–63, 67, 73–76
V
vertical angles, 19, 40, 47
volume of 3D shapes, 278–280
Z
Z patterns, in parallel lines, 40, 47
you are here 4 325

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required