Unit 4 Vocabulary

Midsegment

• Segments connecting the midpoints of triangles

• Creates 4 congruent triangles within the triangle

Isosceles Triangles

• Base side:

• Base angles:

Centroid

• POC of the medians

Median

• Segment connecting the midpoint of a side to the opposite vertex.

Altitude

• Segment from a vertex that intersects the opposite side at a right angle. “Height”

Orthocenter

• POC of the altitudes

Constructing Altitude (or a perpendicular line through a point)

• From the point, make an arc that intersects the line twice.

• Now bisect the segment you made on the line.• Draw in the perpendicular line—remember, it

should intersect the point and the two “fish tails”.

Midsegments

• The midsegment joining the midpoints of two sides are parallel to the 3rd side of the triangle.

• They are also half the length of that side.

Regular Polygons

• Polygons that are equilateral (all sides are congruent) and equiangular (all angles are congruent)

Finding the measure of one angle.

Formula:

nI

2)180-(n

Exterior Angles

• Interior and exterior angles are supplementary.

• I + E = 180

• Formula:

nE

360