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Triangles

+Learning Goal

LG: Identify the characteristics of a given set of triangles according to their sides and/or their interior angles

Kid Friendly: Be able to name different types of triangles

What do I think I know:

+3 Things you already know

about Triangles

A triangle has 3 sides

All angles in a triangle add up to 180 degrees

Two triangles make a quadrilateral

Tri means three

Three vertices

Three angles

+Try your own

Draw a triangle of your choice. Measure and label each angle in the triangle. Were any of the angles the same? Were any of the sides the same length? Or were they all different?

Now draw a totally different triangle. Were any of the angles the same? Were any of the sides the same length? Or were they all different?

Now draw a totally different triangle from the other two you’ve drawn. Were any of the sides the same length? Were any of the angles the same? Or were they all different?

+Two ways to Classify Triangles

By their sides Are any of the sides the same length? If so, how many? You can tell if a side of a triangle is the same as another if it

has markings on the side For example:

By their angles Are any of the angles the same amount? If so, how many? For example:

+Naming a Triangle based on its Sides

Equilateral TriangleThree equal sides Three equal angles, always 60°

Isosceles TriangleTwo equal sides Two equal angles

Scalene TriangleNo equal sides No equal angles

There are three special names given to triangles that tell how many sides (or angles) are equal. There can be 3, 2 or no equal sides/angles:

+Naming a triangle based on its angles

Triangles have names that tell you what type of angle is inside:

Acute TriangleAll angles are less than 90°

Right TriangleHas a right angle (90°)

Obtuse TriangleHas an angle more than 90°

+But!

Remember that triangles can be classified in BOTH ways. So a triangle may be an acute triangle, but it might also be a scalene triangle

Or, it may be an isosceles triangle and a right triangle

+Your Task….

Creatively demonstrate the following: An equilateral triangles An isosceles triangle A scalene triangle An acute triangle A right triangle An obtuse triangle 2 triangles that you classify in TWO different ways

Your materials: Your creative brain Any app you choose on iPads (iMotion, Educreations, Video Fx Live, etc.) The usual classroom items (paper, markers, etc.)

MUST include a plan PRIOR to making the final piece. This may be a script or a sketch of what you plan to make