ja vastaavaa b-janalle d:llä
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0
"b"
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Stuff
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Nelikulmio muodostuu kahdesta kolmiosta, A1A2B2 ja A1A2B1, joiden molemman kanta on jana A1A2. Korkeudet ovat sin(alpha)*(osuus b-janasta), joten yhteensä alaksi tulee
20
equals
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Huomataan, siis että ala ei riipu arvoista c ja d.
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