Thursday, January 15, 2015

Geometry Cabinet Contents


Geometry Cabinet Drawers


Drawer I
Contains six circles varying in diameter from ten to five cm
Drawer II
Six variations of rectangles: 10x10 cm square, 10x9, 10x8, 10x7, 10x6, 10x5
Drawer III
Different types of triangles: equilateral, right-angled isosceles, obtuse-angled isosceles, acute-angled isosceles, right-angled scalene, obtuse angled scalene
Drawer IV
Different regular polygons: pentagon, hexagon, heptagon, octagon, nonagon, decagon
Drawer V
Four curvilinear figures: ellipse, quatrefoil, curvilinear triangle, oval
Drawer VI
Four quadrilaterals: rhombus, right trapezoid, isosceles trapezoid, parallelogram







Geometry Cabinet Definitions

Circle
a closed plane curve consisting of all points at a given distance from a point within it called the center
Rectangle
a parallelogram having four right angles
Square
a rectangle having all four sides of equal length
Triangle
closed plane figure having three sides and three angle
Equilateral
All sides are of equal length; an equilateral triangle is also equiangular
Right-angled
Having one right angle (90°)
Obtuse-angled
Having one angle of greater than 90°
Acute-angled
Having angle of less than 90°
Scalene
Having all sides unequal
Isosceles
Having 2 sides equal
Polygon
A figure, usually closed-plane, having three or more usually straight sides
Pentagon
A polygon having 5 angles and 5 sides
Hexagon
A polygon having 6 angles and 6 sides
Heptagon
A polygon having 7 angles and 7 sides
Octagon
A polygon having 8 angles and 8 sides
Nonagon
A polygon having 9 angles and 9 sides
Decagon
A polygon having 10 angles and 10 sides
Ellipse
a plane curve such that the sums of the distances of each point in its periphery from two fixed points, the foci, are equal; (x2/a2) + (y2/b2)=1; if a=b, the ellipse is a circle
Oval
having the general form, shape or outline of an egg, wider at one end than the other
Quatrefoil
leaf composed of four leaflets; a panel-like ornament composed of four lobes radiating from a common center
Curvilinear triangle
triangle consisting of or bound by curved lines
Rhombus
an oblique-angled  equilateral parallelogram (any equilateral parallelogram except a square)
Parallelogram
quadrilateral having both pairs of opposite sides parallel to each another
Trapezoid
a quadrilateral plane figure having two parallel and two non-parallel sides
Right trapezoid
trapezoid with one right angle
Isosceles trapezoid
trapezoid with two sides of equal length



Geometry Cabinet Cards: 

For each geometric shape in the Montessori geometry cabinet, there are 3 cards on which the shape/inset fits: a solidly filled in one, one with a thick outline and one with a thin outline. 






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