1. Geometry Vocabulary
Geometry - branch of mathematics that deals with points, lines, planes and solids and examines their properties.
Types of the line of the triangle
Polygon

2. POLYGON
REGULAR POLYGON

3. POLYGON
. Parallelogram – quadrilateral with both pairs of opposite sides parallel.
Rectangle – parallelogram with a right angle.
Rhombus – parallelogram with consecutive sides congruent.
Square – all sides congruent and all four right angles.
Trapezoid – quadrilateral with exactly one pair of opposite sides parallel.

4. Types of the line of the triangle

5. Types of the line of the triangle
Midpoint of a segment – a point that divides the segment into two congruent segments.
Median – segment from the vertex of a triangle to the midpoint of the opposite side.
Altitude – segment from the vertex of a triangle perpendicular to the line containing the opposite side.
Midsegment - line segment joining the midpoints of two sides of a triangle.
Perpendicular bisector: A line which cuts a line segment into two equal parts at 90°.
Angle bisector :A line which cuts an angle into two equal halves.

6. Warm-up

7. What is the name of the line passing through the ……,……. and ……
What is the name of the line passing through the ……,…….and ……. of the triangle?
(1): center
(2): centroid
(3): orthocenter