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a right-angled triangle
Please calculate the area of this right-angled triangle.
acute triangle (triangle all of the angles of which are acute)
This figure is an acute triangle.
obtuse triangle
He taught me how to calculate the area of an obtuse triangle.
a tridecagon
He was drawing a tridecagon shape.
a pentadecagon
He was drawing a pentadecagon shape.
a hendecagon
He drew a hendecagon shape.
a tetradecagon
He drew a tetradecagon shape.
a dodecagon
He drew a dodecagon shape.
a heptadecagon
He is good at drawing a heptadecagon.
a hexadecagon
He was drawing a hexadecagon shape.
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