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TGAU Mathemateg Datrys Problemau Siâp a Mesur Haen Uwchradd

TGAU Mathemateg Datrys Problemau Siâp a Mesur Haen Uwchradd. Mae ongl fewnol polygon rheolaidd pedair gwaith ongl allanol y polygon. Beth yw enw’r polygon yma ?. Pa wybodaeth sydd wedi ei roi yn y cwestiwn ?. Ongl fewnol = Ongl allanol. 4 x. (n-2) x 180˚

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TGAU Mathemateg Datrys Problemau Siâp a Mesur Haen Uwchradd

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  1. TGAU Mathemateg DatrysProblemau Siâp a Mesur HaenUwchradd

  2. Mae onglfewnol polygon rheolaiddpedairgwaithonglallanol y polygon. Beth ywenw’r polygon yma? • Pa wybodaethsyddwedieiroiyn y cwestiwn? • Onglfewnol = Onglallanol • 4 x • (n-2) x 180˚ • n • 360˚ • n • = • 4 x • Datryswch yr hafaliadiddarganfod n (nifer yr ochrau) • n(n-2) x 180 = 4n(360) • n n • Lluoswch y ddwyochrgan n • (n-2)180 = 4(360) • Ehangwch y cromfachau • 180n - 360 = 1440 • Adiwch 360 i’rddwyochr

  3. 180n = 1440 + 360 • Rhannwch y ddwyochr â 180 • 180n = 1800 • n = 10 • Os yw n = 10 ynabethywenw’r polygon? • Os yw n = 10 ynaniferochrau’r polygon yw 10. Felly, enw’r polygon ywDECAGON.

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