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任何三角形內角和180度(五上數翰４－２)
Author:
陳民峰
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Area of quadrilaterals, sectors and circles.
Miscellaneous exercise Q.5
Spirolaterals 1
midsegments
hexagon
New Resources
testfileTue Nov 13 21:01:15 CET 20180.0338087314839316
Coins in a row
Example QF.2.1
Transformations of Parabolas
TRIANGLE
