PRESS2010_EN

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4＝π（R2－r2）A＝πD2－d2A＝Area2＝ab sinγA＝ahA＝abA＝AreabγααrA＝πA＝h＋h12 b4 sinα2 ＝ nR2A＝na24 cot α ＝nr2tan α2 α1dR2chbhaaabacbahbCDBbhAarRbhcRdDrbcbhraCbtRrCbDaAa2＝360πr2A＝brA＝πabA＝ahh＝b2－c22 h2（π180 －sin）2A＝r2 ＝r（b－c）＋chA＝a＋bA＝πR2α12 a2A1＝ha＋b2 b2A2＝ha＋bA2－A1＝h2（b－a） aA1C2α2RrC1α°A2b3 ab3 ab4＝πr2＝sdA＝d2 π4Rerimeter s＝πd360（R2－r2）360 － πr2α2360 － aC121140TriangleTrapeziaTrapeziumRectangleParallelogramEquilateral polygonPlane of projectionRoundh1RingSectorEllipseLuneArchArchParabolaBAreaACD　　A1＝ 2AreaABC　　A2＝ 1Calculation of Area