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Tofauti kati ya marekesbisho "Pembemraba"
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[[Image:Pembemraba 90°.PNG|thumb|Pembemraba]]
'''Pembemraba''' ni [[Pembe (jiometria)|pembe]] yenye kiwango cha [[nyuzi]] 90.
Kama mistari miwili yapandana kuna pembe nne zinazojitokeza. Kama pembe hizi zote ni sawa basi ni pembemraba.
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