Marci of Kronland, Johannes Marcus
,
De proportione motus figurarum recti linearum et circuli quadratura ex motu
,
1648
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THEOREMA XI.
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Si ne〈qué〉 motus Quadrati, ne〈que〉 huius diameter ad angulos rectos ſe
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cet planum, ad angulos inæquales reflectit.
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<
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>Motus Quadrati
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abcd
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obliquè ſecans planum
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gr,
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habeat
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latus
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ad
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eidem plano parallelum: & ſit linea hypomochlij
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dg.
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ad eam verò perpendicularis
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eh;
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|cuius quadratum grauitas
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movens centri,
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huius complementum quadratum
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fi,
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pla
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ga eiuſdem centri. </
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fie
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conſtituit chorda reliqua, in quo chorda
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ie
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ſit ſumpta æ
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qualis
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eh.
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Et quia plaga fit per lineas
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ea. ef. ed:
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per 4. theo. 2 part.
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erit per 3 theor: huius, motus reflexus in lineâ
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ek;
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motus
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autem centri in lineâ plano
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qr
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parallelâ, ſeu tangente cir culi
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centro
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f,
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& interuallo
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fe
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deſcripti. quòd ſi ergo fiat ut
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ci
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ad
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if,
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ita
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em
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ad
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ek,
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erit per prop: 32 motus medius
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el
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diameter
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parallelogrammi
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kelm:
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dico angulum reflexionis
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lem
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eſſe in
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æqualem angulo
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adg.
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Quia enim angulus
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afi
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externus ma
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ior eſt angulo interno
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adh,
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æqualis autem angulo
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ief
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per 9.
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theor:
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huic æquatur angulus
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lem,
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propterea quòd ſimilia
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ſint triangula
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ief, mel:
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erit
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æqualis angulo externo
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afi,
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maior verò angulo interno
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fdh
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angulo nimirum inci
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dentiæ. </
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THEOREMA XII.
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Motus Pentagoni ſecans obliquè planum, ſi latus oppoſitum habeat
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eidem plano par allelum, ad angulos æquales reflectit.
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<
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abcde
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habeat latus
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cd
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plano
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op
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parallelum
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& oppoſitum: dico ad angulos reflecti æquales. </
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<
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