Geometry - Essential Memorizations

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This list will provide you with the essentials to memorize, streamlining your geometry experience. Side note - this list is for all regular polygons

Geometry & Trigonometry

SAT

Math

Essentials

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82 Terms

1
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Sum of angle measures in triangle

180

2
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Sum of angle measures in quadrilateral

360

3
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Sum of angle measures in pentagon

540

4
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Sum of angle measures in hexagon

720

5
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Sum of angle measures in heptagon

900

6
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Sum of angle measures in octogon

1080

7
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Sum of angle measures in nonagon

1260

8
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Sum of angle measures in decagon

1440

9
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Sum of angle measures in hendecagon

1620

10
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Sum of angle measures in dodecagon

1800

11
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2²

4

12
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3²

9

13
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4²

16

14
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5²

25

15
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6²

36

16
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7²

49

17
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8²

64

18
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9²

81

19
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10²

100

20
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11²

121

21
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12²

144

22
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13²

169

23
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14²

196

24
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15²

225

25
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16²

256

26
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17²

289

27
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18²

324

28
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19²

361

29
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20²

400

30
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21²

441

31
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22²

484

32
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23²

529

33
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24²

576

34
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25²

625

35
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2³

8

36
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3³

27

37
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4³

64

38
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5³

125

39
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6³

216

40
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7³

343

41
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8³

512

42
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9³

729

43
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10³

1000

44
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11³

1331

45
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12³

1728

46
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2⁴

16

47
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3⁴

81

48
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4⁴

256

49
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5⁴

625

50
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2⁵

32

51
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3⁵

243

52
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4⁵

1024

53
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5⁵

3125

54
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2⁶

64

55
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3⁶

729

56
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4⁶

4096

57
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5⁶

15625

58
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Interior angle measure of a triangle

60

59
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Interior angle measure of a quadrilateral

90

60
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Interior angle measure of a pentagon

108

61
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Interior angle measure of a hexagon

120

62
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Interior angle measure of a heptagon

128.57

63
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Interior angle measure of an octagon

135

64
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Interior angle measure of a nonagon

140

65
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Interior angle measure of a decagon

144

66
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Interior angle measure of a hendecagon

147.27

67
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Interior angle measure of a dodecagon

150

68
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Exterior angle measure of a triangle

120

69
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Exterior angle measure of a quadrilateral

90

70
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Exterior angle measure of a pentagon

72

71
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Exterior angle measure of a hexagon

60

72
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Exterior angle measure of a heptagon

51.43

73
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Exterior angle measure of an octagon

45

74
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Exterior angle measure of a nonagon

40

75
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Exterior angle measure of a decagon

36

76
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Exterior angle measure of a hendecagon

32.73

77
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Exterior angle measure of a dodecagon

30

78
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Pythagorean triple: 3,4…

5

79
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Pythagorean triple: 5, 12…

13

80
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Pythagorean triple: 8, 15…

17

81
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Pythagorean triple: 7, 24…

25

82
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Pythagorean triple: 9, 40…

41