Download Classify Triangles - Trimble County Schools

BA
1.
Find the midpoint of the line between A(-2,4) and B(4,6)
2.
Find the endpoint if the midpoint of the line is M(3,6) and the other endpoint is
(-1,2).
Geometry – Lesson 4.1
OBJ:
________________________________________________________________________
_______________________________________________________________________.
Classifying triangles by their angles:
_________________________ – has one right angle
___________________ – has three acute angles
_____________________ – has one obtuse angle
Classifying triangles by their sides:
___________________ – no congruent sides
___________________ – three congruent sides
___________________ – at least two congruent sides
____________________ – each of the three points joining the sides of a triangle.
_______________________ – in a triangle, two sides sharing a common vertex.
In a right triangle, the sides that form the right angle are the ____________ of the
triangle. The side opposite the right angle is the ___________ of the triangle.
In an isosceles triangle, the two congruent sides are called the________ of the triangle
and the third side is called the _____________.
When the sides of a triangle are extended, other angles are formed. The three original
angles are the interior angles and adjacent to these are the exterior angles.
Theorem 4.1 _____________________________
The sum of the measures of the interior angles is 180°.
1.
Find angle C.
Theorem 4.2 ______________________
The measure of an exterior angle of a triangle is equal to the sum of the measures of the
two nonadjacent interior angles.
2.
3.
Corollary
To the triangle sum theorem.
The acute angles of a ___________________ are complementary.
4.