Formula for finding the perimeter of a cone

Mathematics

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Answer

C=2πrC = 2\pi r

Neno "perimeter" kwa kawaida hutumika kuelezea urefu wa mpaka wa umbo la pande mbili (2D). Konu ni umbo la pande tatu (3D).

Kwa konu, tunaweza kurejelea mzingo wa duara la msingi wake. Mzingo huu ndio "perimeter" ya msingi wa konu.

Formula ya kupata mzingo wa duara (circumference) ni:

C=2πrC = 2\pi r

ambapo:

  • CC ni mzingo (circumference)
  • π\pi (pi) ni takriban 3.14159
  • rr ni rediasi ya duara la msingi

Ikiwa unatumia kipenyo (dd) badala ya rediasi, formula ni:

C=πdC = \pi d

kwa sababu d=2rd = 2r.

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