5.1 Angles of Triangles with answers - Noble's Teaching Website

5.1 Angles of Triangles with answers

5.1 Angles of Triangles

1

5.1 Angles of Triangles with answers

Classifying Triangles

Classify the following triangles by their sides.

Equilateral triangle: all sides are congruent

Isosceles Triangle: two sides are congruent.

Scalene triangle: no two sides are congruent.

? An equal number of slashes on sides of a triangle indicate that those sides are congruent.

2

5.1 Angles of Triangles with answers

Classify the following triangles by their angles.

? All triangles have at least 2 acute angles. The third angle is used to classify the triangle.

50 Acute Triangle: 70

all angles are less

than 90 degrees.

10

120

Obtuse Triangle: one angle is more than 90.

50

60

Right Triangle:

one angle is 90

30

degrees

60

60

Equiangular

Triangle:

all angles are

equal measure.

60

60

3

5.1 Angles of Triangles with answers

Triangle Sum Theorem:

The sum of the measure of the interior angles of a triangle is 180o.

Exterior Angle Theorem:

The measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles.

4

5.1 Angles of Triangles with answers

Isosceles Triangles

Equilateral Triangle

? Name the vertex angle and base angles:

? Solve for x and y:

5

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download