Triangles I can differentiate between the different types

Triangles I can differentiate between the different types of triangles. Created by: Maggie Howe and Rachel Tankersley Sycamore Elementary 5 th grade

Essential Questions: What is a triangle? How do you classify triangles? What is an acute triangle? What is a right triangle? What is an obtuse triangle? What is an isoscelse triangle? What is an equilateral triangle? What is a scalene triangle?

§ Triangles are everywhere. § They can be found bracing a bridge.

§ Triangles can be found racking up billiard balls.

§ Triangles can be classified by sides. § OR § Triangles can be classified by angles.

TRIANGLES BY SIDES § SCALENE § ISOSCELES § EQUILATERAL

SCALENE TRIANGLE § WHEN 3 PEOPLE GET ON THE SCALES TO SEE HOW MUCH THEY WEIGHT, EACH ONE WEIGHS A DIFFERENT AMOUNT. SO…………

§ A scalene triangle has no equal sides. § All sides are different lengths.

Isosceles Triangles § Isosceles triangles have 2 equal sides. § The angles opposite the equal sides are also equal. <B = <C AB = AC

Equilateral Triangles § All 3 sides of an equilateral triangle are equal. § Each angle must be 60 degrees.

§ Now let’s review. § What kind of triangle has all 3 sides and angles equal?

Equilateral Triangle

§ What kind of triangle has all sides a different length ?

SCALENE TRIANGLE

§ What kind of triangle has 2 equal sides?

AN ISOSCELES TRIANGLE

TRIANGLES BY ANGLES § Acute § Right § Obtuse

§ A right triangle has one 90 degree or RIGHT angle.

Acute triangles 3 angles less than 90 degrees.

OBTUSE TRIANGLE § An obtuse triangle has one obtuse angle.

What type of triangle is this? § Use right, obtuse, or acute.

What type of triangle is this? § Use right, obtuse, or acute.

What type of triangle is this? § Use right, obtuse, or acute.

What type of triangle is this? § Use right, obtuse, or acute.

What type of triangle is this? § Use right, obtuse, or acute.

What type of triangle is this? § Use isosceles, scalene, or equilateral.

What type of triangle is this? § Use isosceles, scalene, or equalateral.

What type of triangle is this? § Use isosceles, scalene, or eqilateral.

What type of triangle is this? § Use isosceles, scalene, or equilateral.

What type of triangle is this? § Use isosceles, scalene, or equilateral.

Which one of these is labeled incorrectly? Right Triangle Equilateral Triangle Scalene Triangle

Follow Up Draw an acute triangle. Draw a right triangle. Draw an obtuse triangle. Draw an isoscelse triangle. Draw an equilateral triangle. Draw a scalene triangle. Answer the following questions: Can you have an acute, scalene triangle? Can you have a right isoscelese triangle? 32 Can you have an obtuse, equilateral triangle?