90

90（90It comes, the ゅ maggot ゅ う, the そ here) natural number, in addition integer,89 being next 91 It is a quantity before.

Mathematical character

• As for 90 composite number, divisor 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45 and 90 is.
• trigonometric function cos90° = 0, sin90° = 1
• AngleThe 90° hits to four half lap,VerticalityFrom the fact that it mixesRight angleWith you say.
• SquareInterior angle・External angle・Central angleEach of them is a 90°.
• 1/90 = 0.01... (As for underline sectionCirculating paragraph. 90 inverse number 1)

In addition be related to 90

• soccer 90 minute, the middleHalftimeSo 2 it is divided.
• Soldier/finishing 寿: Full 90 years old (former times full 89 year old = 90th years) celebration. Soldier/finishing abbreviation (卆) in from the fact that it is visible "90".
• atomic number90 turn thorium.
• Sigeo NagasimaWhen immediately after the retiring, first supervising the giant troop, as for back number 90th.
• 90 type tanks（Ground Self-Defense Force).

Related item

• • 0 10 20 30 40 50 60 70 80 90 100
  • 91 92 93 94 95 96 97 98 99
• western calendar90 years B.C. 90 year 1990 year
• Summary of concrete number