GEOMETRYMILBY HIGH SCHOOL

MR. SAUCEDO

4.1 Applying Triangle Sum Properties

OBJECTIVE

We will classify triangles and find measures of their angles.

REVIEW

On your notebook, draw an example of the following. A triangle A Scalene Triangle Isosceles Triangle Equilateral Triangle Acute Triangle Right Triangle Obtuse Triangle Equiangular Triangle

CLASSIFYING TRIANGLES

We can classify We can also classify

triangles by their … Triangles by their…

REVIEW:Classifying triangles by their angles

REVIEWClassifying by Triangle Sides

CHECKPOINT

CLASSIFY THE FOLLOWING TRIANGLES. (WORD BANK: Scalene, isosceles, equilateral, acute, right, obtuse,

equiangular)

CHECKPOINT

Label the followingTriangles by theirAngles and sides.

GUIDED PROBLEM 1

Classify the triangleBy its sides, then Determine if is a Right triangle.

CHECKPOINT

Classify the triangle by its sides, then determine if is a right triangle.

TRIANGLE SUM THEOREM

The sum of the measures of the interior angles of a triangle is 180 degrees.

EXTERIOR ANGLES

EXTERIOR ANGLE THEOREM

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

CHECKPOINT

Find the measurement of Angle x.

GUIDED PROBLEM

Find the measure of the exterior angle.

CHECKPOINT

Find the measurement of the exterior angle CBD.

CHECKPOINT

Find x.

INDEPENDENT PRACTICEEnter the responses in your clickers.

1. Problem 52. Problem 12: What kind of triangle is it?3. Problem 12: Is it a right triangle?4. Problem 14: what is x?5. Problem 16: What is x?6. Problem 197. Problem 228. Problem 319. Problem 34: what is x?

HOMEWORK

SECTION 4.1

Problems: 1, 2, 3, 4, 7, 10, 11, 14, 15, 17, 18, 19, 20, 22.

Pre AP: Add problem 23 & 25.