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Level 139

Tools of Geometry


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1/2 b*h
Area of a triangle
2 pi* r
Circumference of a circle
translation
It is a transformation that moves points the distance and in the same direction.
reflection
It is a transformation that flips a figure over a line of reflection.
rotation
It is a transformation that turns a figure about a fixed point.
Central Angle
an angle whose vertex is the center of the circle
corresponding angles
Angles that have the same relative positions in geometric figures.
alternate interior angles
Angles that lie within a pair of parallel lines and on opposite sides of a transversal; congruent
Circle
in a plane, the set of all points equidistant from a given point
Center
Each regular polygon has a center because it can be inscribed in a circle.
radius
From center to a point on the circle.
Chord
is a segment whose endpoints lie on the circle
diameter
A straight line passing through the centre of a circle to touch both sides of the circumference.
cylinder
A solid shape with one curved surface and two congruent circular bases.
cone
A solid shape with a circular base and a curved surface that come to a point (vertex).
sphere
A solid shape that is perfectly round like a ball. No faces, edges, or vertices.