Geometry Flashcards

Flashcards on Triangles and Circles

Isosceles triangle

Triangle with two equal sides and one different side.

Equilateral triangle

Triangle with three equal sides.

Scalene triangle

Triangle with three different sides.

Acute angle triangle

Triangle with three acute angles.

Right angle triangle

Triangle with a right angle.

Circumcenter

Point where the perpendicular bisectors of a triangle meet.

Centroid

Point where the medians of a triangle meet.

Incenter

Point where the angle bisectors of a triangle meet.

Orthocenter

Point where the altitudes of a triangle meet.

Euler's line

Line that joins the orthocenter, centroid, and circumcenter of a triangle.

Chord

Line segment that joins two points of a circle.

Arc

Part of a circle between two points on it.

Inscribed angle

Angle with its vertex on the circle and chords as sides.

Secant

Line that intersects a circle at two distinct points.

Central angle

Angle formed by two radii of a circle.

Tangent

Line that touches a circle at a single point.

Diameter

Line segment joining two points of the circle passing through the center.

Interior angle

Angle formed by two chords that intersect each other inside a circle.

Radius

Line segment from the center of a circle to a point on the circle.

Circle

Set of points equidistant from a single point.

Center

Point that is equidistant from all its vertices.

radius

Line segment from its center to any Vertex

apothem

Line segment from its center to the midpoint of any Side

π

The number of times the diameter of a circle fits across its circumference.

Circle

a 2-dimensional shape where all points on the circumference are equisant from a center point.

length of an arc

Portion of a circle's circumference.

Sector of a circle

is the region between two radii and the arc intercepted by the central angle they form

Circle segment

it's the region between a chord and the arc it intercept.

Congruent

Condition where triangles are identical in shape and size.

Similarity

Condition where triangles have the same shape but may differ in size.

isosceles triangle properties

Two equal sides and angle

Area of a triangle

A = 1/2 × b × h

Area of a rectangle

A = base * height

Area of a Parralelogram

A=bh

Area of a trapezoid

A = ((base1+base2) * height) / 2

Area of a square

A = side^2

Area of a circle

A = π * r^2

Area of a Kite

A = (diagonal1*diagonal2) / 2