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CLASS 11 CBSE B.St Project AIDS TO TRADE - INSURANCE
Geovocab
1. Geometric Vocabulary
Shape Description Examples
Multiple Closed Curves
Concave
One or more diagonals
of a concave figure are
outside the figure.
Convex
All diagonals of a convex
figure are inside the
figure.
Symmetrical
A figure that can be
folded so that the two
parts match exactly has
line, or reflection,
symmetry.
A figure that coincides
with the original figure
after it has been rotated
less than 360º has
rotational symmetry.
Asymmetrical
A nonsymmetrical figure
has neither line nor
rotational symmetry.
Polygons
Polygons
Polygons are simple
closed curves with all
straight sides. Regular
polygons have all sides
and all angles congruent.
Concave
Line
symmetry
Line and
rotational
symmetry
No symmetry
2. Triangles (classified by
properties of sides)
Equilateral
Equilateral triangles
have all sides congruent.
Isosceles
Isosceles triangles have
two sides congruent.
Scalene
Scalene triangles have
no sides congruent.
Triangles (classified by
properties of angles)
Right
One angle of a right
triangle is equal to 90º.
Acute
All angles of an acute
triangle are less than
90º.
Obtuse
One angle of an obtuse
triangle is greater than
90º.
Quadrilaterals (convex)
A quadrilateral is a
polygon with four sides.
3. Kite
A kite has two pairs of
congruent adjacent
sides.
Trapezoid*
A trapezoid has exactly
one pair or parallel sides.
Isosceles trapezoid
The opposite nonparallel
sides of an isosceles
trapezoid are congruent.
Parallelograms
A parallelogram is a
quadrilateral with two
pairs of parallel sides.
Rectangle
A rectangle is a
parallelogram with four
right angles.
Rhombus
A rhombus is a
parallelogram with all
sides equal.
Square
A square is a
parallelogram with four
right angles and all sides
equal.
*Some authors choose to define trapezoid as a quadrilateral with at least one
pair of parallel sides. That definition is more inclusive and leads to the
conclusion that all parallelograms are trapezoids. The Navigations books adopt
the classical definition that a trapezoid is a quadrilateral with exactly one pair of
parallel sides.
4. Prisms
Prisms have two parallel
bases that are congruent
polygons; the lateral
faces are parallelograms
formed by segments
connecting
corresponding vertices of
the bases. Prisms are
named for the shape of
their bases (e.g.,
triangular prism, square
prism, etc.)
Pyramids
Pyramids have bases
that are polygons; the
lateral faces are triangles
that meet at a common
vertex. Pyramids are
named for the shape of
their bases (e.g.,
triangular pyramid,
square pyramid, etc.).
Cylinders
Cylinders have curved
lateral surfaces joining
two parallel bases that
are congruent circular
regions. Segments
connecting
corresponding points on
the bases are parallel.
Cones
Cones have curbed
lateral surfaces and
bases that are circular
regions.
