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63=64=65 ?

作者:Alex CHIK

64=65?

64=63?

Some students say the area of the following figure is 69, some say that is 70. What do you think?

Some students say the area of the following figure is 69, some say that is 70. What do you think?
Source: http://www.foster77.co.uk/50maths (#49: Tricky Triangles)
GeoGebra 互動數學教室 http://www.geogebra.hk

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