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pentagon (regular)	pięciokąt (foremny)
hexagon (regular)	sześciokąt (foremny)
circle	koło
ellipse	elipsa

1.2.8. Three-dimensional (3-D. spatial) fiaures

face	ściana
tetrahedron	czworościan
cube	sześcian
octahedron	ośmiościan
pyramid	ostrosłup
bipyramid	bipiramida
prism	graniastosłup
cylinder	walec
sphere	kula
cone	stożek

1.2.9. Exercise

1. Choose the appropriate expressions.

Ali the angles in an equilateral / isosceles triangle are equal and obtuse / acute. A square may be viewed as a rectangle with all its angles / sides equal or as a rhombus with all its angles / sides equal. The Pythagorean statement / theorem applies only to right angles / right-angled triangles. The benzene ring is usually represented as a regular pentagon / hexagon.

The methane molecule has a tetrahedral / octahedral shape. Atoms may be imagined as very smali circles / spheres. An octahedron has eight identical triangular sides / faces. A molecule of phosphorus(lll) chloride PCI3/ phosphorus(V) chloride PCI₅ may take the shape of either a square pyramid or a triangular bipyramid.

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