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In the following figure, find the value of x.
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4 stepsHaya hapa masuluhisho ya swali ulilotuma:
Qn 18:
Katika mchoro ufuatao, tafuta thamani ya .
Mchoro: Mchoro unaonyesha duara yenye kituo O. AB ni tangent kwa duara kwenye B, na urefu wake ni 15 cm. OB ni radius ya duara, na urefu wake ni 8 cm. Mstari AO unapita katikati ya duara, na sehemu ya mstari kutoka A hadi sehemu ya kwanza ya duara (wacha tuiite C) imeandikwa .
Tambua pembetatu ya kulia na tumia theorem ya Pythagoras.
Radius OB ni perpendicular kwa tangent AB kwenye sehemu ya kugusa B. Hivyo, ni pembetatu ya kulia na .
Tunajua:- OB (radius) =
- AB (tangent) = Tunahitaji kupata urefu wa hypotenuse OA.
Kokotoa urefu wa OA.
Tumia urefu wa OA na radius kupata .
Mstari AO unapita katikati ya duara. Sehemu ya mstari kutoka O hadi kwenye duara (OC) ni radius.
Hivyo, OC = .
Kutoka kwenye mchoro, tunaona kwamba OA ni jumla ya AC na OC.Tunajua OA = , AC = , na OC = .
Tatua kwa .
Thamani ya ni .
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