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a tridecagon
He was drawing a tridecagon shape.
a triangle (polygon)
He drew a triangle on the blackboard.
Kyūjitai form of 正十二面体: regular dodecahedron
This regular dodecahedron is a geometric shape with perfect symmetry.
Kyūjitai form of 正二十面体: regular icosahedron
This solid is called a regular icosahedron, and it is made up of 20 equilateral triangles.
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.
Kyūjitai form of 十二面体: dodecahedron
He made a model of a dodecahedron.
twenty; 20
It takes twenty minutes to get to my house.
(mathematics) equilateral triangle
He drew an equilateral triangle shape.
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