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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12. Katika mchoro hapa chini, laini OP inalingana na laini RS. Pembe OPR ni mara mbili ya pembe PRS. Tafuta ukubwa wa pembe OPR.
Step 1: Tambua uhusiano kati ya pembe. Kwa kuwa laini inalingana na laini (), na ni laini inayokatisha (transversal), pembe na ni pembe za ndani zinazoelekeana (consecutive interior angles). Hizi pembe hujumlisha hadi . Hivyo, .
Step 2: Tumia taarifa iliyotolewa kuunda mlinganyo. Tunajua kwamba . Wacha . Basi, . Badilisha hizi kwenye mlinganyo wa Step 1:
Step 3: Tatua kwa .
Step 4: Tafuta ukubwa wa pembe OPR. Tunajua . Ukubwa wa pembe OPR ni .
13. Wakati wa mashindano ya mpira wa miguu, timu ilifunga magoli yafuatayo katika mechi tofauti: 8, 5, 6, 5, 4 na 2. Tafuta wastani wa idadi ya magoli yaliyofungwa kwa kila mechi.
Step 1: Jumlisha idadi yote ya magoli. Jumla ya magoli =
Step 2: Hesabu idadi ya mechi. Kuna idadi ya magoli 6 yaliyotolewa, kwa hivyo kuna mechi 6.
Step 3: Kokotoa wastani (mean). Wastani = Wastani wa idadi ya magoli yaliyofungwa kwa kila mechi ni .
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12. Katika mchoro hapa chini, laini OP inalingana na laini RS.
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.