A vertex (pl. vertices)

A (straight) line- a line segment- a ray

Draw a line segment \(\overline{AB}\) of length 8 cm

Join the endpoints of these two segments to get a line segment parallel to the diameter

Build the midpoint \(J\) of segment \(BD\)

Build the point \(E'\) such that \(K\) is also the midpoint of \(AE'\)

Angles' notations

\(AC\perp BC\)

The coordinates /kəʊˈɔːdɪneɪts/ of a point

The \(x\)-coordinate (or the abscissa /æbˈsɪsə/) of a point

The \(y\)-coordinate (or the ordinate /ˈɔːdɪnət/) of a point

The line intersects the circle at two points

The line segment QR has length 12

A- B and C are collinear /kɒlˈɪniər/ points in the plane

A Cartesian /kɑːˈtiziən/ coordinate system

An ellipse /iˈlɪps/ is defined as follows

A straight angle

An acute /əˈkjuːt/ angle

An obtuse /əbˈtjuːs/ angle

A reflex /ˈriːfleks/ angle

Two angles are congruent /ˈkɒŋɡruənt/

Vertical angles are a pair of opposite angles formed by two intersecting lines

The circumference /səˈkʌmfərəns/ of a circle

The geometric figure is not drawn accurately /ˈækjərətli/ (We often see/write- Diagram not drawn to scale or simply- Diagram not to scale)

A geometric /dʒiːəˈmetrɪk/ figure/shape

A line (or an axis /ˈæksɪs/) of symmetry /ˈsɪmətri/

These angles are supplementary /sʌplɪˈmentri/

These angles are complementary /kɒmplɪˈmentri/

A radius /ˈreɪdiəs/ of a circle