Geometry Section 3.3 Pt 1

Geometry Section 3.3

Parallel lines and the triangle angle sum theorem Part 1

Multiple Select

Use the angles to choose the correct names for the triangle.

• isosceles

• equiangular

• right

• acute

• obtuse

Multiple Select

Use the angles to choose the correct name for the triangle.

• isosceles

• equiangular

• right

• acute

• obtuse

Multiple Select

Use the angles to choose the correct names for the triangle.

• isosceles

• equiangular

• right

• acute

• obtuse

A triangle with three equal angles.

Equiangular Triangle

​An triangle with THREE acute angles.

​​Acute Triangle

​An triangle with ONE obtuse angles.

​​Obtuse Triangle

A triangle with ONE right angle

​​Right Triangle

Equiangular and Acute.

​An acute triangle doesn't have to be equiangular.

​​Acute

Can a right triangle also be obtuse? acute?

​​Right Triangle

Combinations

Multiple Select

Use the sides and angles to choose the correct names for the triangle.

• isosceles

• equiangular

• right

• acute

• scalene

Multiple Select

Use the sides and angles to choose the correct names for the triangle.

• isosceles

• equilateral

• right

• acute

• scalene

Equiangular

​Can an acute triangle be scalene? isosceles? equilateral

​​Acute

Can a right triangle also be scalene? isosceles? equilateral?

​​Right Triangle

Combinations

​will always be equilateral and acute and isosceles.

Given the parallel lines:

What is the relationship of angle 3 and angle 4?​

​What is the relationship of angle 5 and angle 2?

​

Use substitution.

Fill in the Blanks

Find the measure of the missing angle.

Open Ended

Talk with your neighbor. 

Can a triangle have three equal sides and if so, what would the angles measure?

Open Ended

Talk with your neighbor. 

Can a triangle have two right angles?

Why or why not?

Open Ended

Talk with your neighbor. 

If a triangle has a right angle, what is the sum of the remaining acute angles?

​Formative 3.3 Day 1

​#7, 8, 12, and 14 - 23

We will complete the rest tomorrow.