This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
BC = 4 cm
Step 1: Tambua theoremu inayofaa. Tatizo hili linahusisha theoremu ya Tangent-Secant. Theoremu hii inasema kwamba ikiwa sehemu ya tangent na sehemu ya secant zimetolewa kwenye duara kutoka sehemu ya nje, basi mraba wa urefu wa sehemu ya tangent ni sawa na zao la urefu wa sehemu ya secant na sehemu yake ya nje.
Step 2: Andika mlinganyo kulingana na theoremu. Kutoka kwenye mchoro, DC ni tangent na CA ni secant. CB ni sehemu ya nje ya secant. Hivyo, kulingana na theoremu ya Tangent-Secant:
Step 3: Badilisha thamani zinazojulikana na ueleze urefu usiojulikana. Tunapewa cm na cm. Hebu . Kisha . Badilisha hizi kwenye mlinganyo:
Step 4: Panga upya mlinganyo kuwa mlinganyo wa quadratic.
Step 5: Tatua mlinganyo wa quadratic kwa . Tafuta namba mbili zinazozidishwa kutoa -36 na kujumlishwa kutoa 5. Namba hizo ni 9 na -4. Hii inatoa suluhisho mbili zinazowezekana kwa :
Step 6: Chagua suluhisho halali. Kwa kuwa inawakilisha urefu, lazima iwe thamani chanya. Kwa hiyo, . Hivyo, cm.
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This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.