By Jan, Marcia, Carole, and Donna Adapted By Suzanne & Stephanie

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Presentation transcript:

By Jan, Marcia, Carole, and Donna Adapted By Suzanne & Stephanie Trying Triangles By Jan, Marcia, Carole, and Donna Adapted By Suzanne & Stephanie

Can You Answer These Questions? Tell me what a triangle looks like. How many sides does every triangle have? Would you count the sides of this triangles for me? How are the triangles like the other objects? How are they different? Would you count the number of sides on some of the shapes around the room for me so we can see if they are triangles? Do you know the types of triangles? Do you know the types of angles that they have?

Triangle A triangle is one of the basic shapes of geometry. A two-dimensional figure with three vertices and three sides which are straight line segments.

Types of Triangles GET READY!!!!!

Isosceles Triangle Two sides are of equal length and they have two equal angles.

Scalene Triangle all sides have different lengths and all angles are different.

Equilateral Triangle Three sides have equal length and three angles of equal size (which are all 60 degrees.)

Right Angle Right Triangles (right-angled triangles) have one right angle (equal to 90°). It is possible to have a right isosceles triangle - a triangle with a right angle and two equal sides.

Acute Angel Acute triangles have all acute angles (angles less than 90°). It is possible to have an acute triangle which is also an isosceles triangle - these are called acute isosceles triangles.

Obtuse Angle Obtuse triangles have one obtuse angle (angle which is greater than 90°). It is possible to have a obtuse isosceles triangle - a triangle with an obtuse angle and two equal sides.

Tricky Triangles How many triangles are in this drawing? Name the different types of triangles you find. How many of each type of triangle can you find? http://nrich.maths.org/public/viewer.php?obj_id=1025&part=index&refpage=leg.php

Find the Triangles How many triangles are in this drawing? Look very carefully! You might have to draw the shape many times and mark each triangle you find. http://nrich.maths.org/public/viewer.php?obj_id=928&part=index&refpage=leg.php

Heptagon Triangles How many different triangles can you find in this shape? http://nrich.maths.org/public/viewer.php?obj_id=195&part=index&refpage=leg.php

Hiding Triangles How many triangles can you find? Look very carefully, some are hiding! http://nrich.maths.org/public/viewer.php?obj_id=138&part=index&refpage=leg.php

THE TRIANGLE SONG

Additional Website Activities http://nrich.maths.org/public/viewer.php?obj_id=967&part=index&refpage=leg.php http://nrich.maths.org/public/viewer.php?obj_id=2124&part=index&refpage=leg.php http://nrich.maths.org/public/viewer.php?obj_id=2852&part=index&refpage=leg.php

Good job!!!