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PLZ HELP ASAP CROSS SECTIONS OF 3D FIGURES

PLZ HELP ASAP CROSS SECTIONS OF 3D FIGURES-example-1

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All of them. Remember that equilateral triangle is also isosceles triangle.

See attachments on how to get isosceles triangle:
PLZ HELP ASAP CROSS SECTIONS OF 3D FIGURES-example-1
User Apostolov
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You could slice each of them to form an iscoceles triangle 
User Kerim Emurla
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