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# Triangles

3rd Grade Math

by

Tweet## Tamara Bartschi

on 4 April 2013#### Transcript of Triangles

Essential Question Objective: Identify, classify, and explain the properties of triangles. equilateral triangle: isosceles triangle: scalene triangle: right triangle: obtuse triangle: acute triangle: a triangle with 3 equal sides a triangle with 2 equal sides a triangle with 3 sides

of different lengths a triangle with 1 right angle that forms a 90° square corner a triangle with

1 obtuse angle

larger than a right angle a triangle with 3 acute angles

smaller than a right angle http://studyjams.scholastic.com/studyjams/jams/math/geometry/classify-triangles.htm http://studyjams.scholastic.com/studyjams/jams/math/geometry/classify-angles.htm Reason with shapes and their attributes.

MCC3.G.1 Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals). Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories. http://rpsec.usca.edu/Classwork/703sp2004/RaceCar/triquiz.htm CC Standard How can you name and sort triangles by their sides and by their angles? Class Quiz 1 *Triangle angles are measured in degrees. the length of its

the size of its How do I know

the names of

triangles? 3 equal sides? 2 equal sides? No equal sides?

What are the SIDES? Exactly 90°? Less than 90°? More than 90°? What

are the ANGLES? Ask yourself these questions. Did you know Triangles

have

names? sides angles Triangles

can have... 3 equal sides

2 equal sides

no equal sides equilateral isosceles scalene right acute obtuse 2" 2" 2" 3" 3" 2" Triangles with Side Names: *Create with Anglegs 3" 5" 4 1/2" Triangles with Angle Names: We are going to name

some triangles today! Triangle names can come from... Hands-on Ticket Out the Door and Triangles Side Angle Triangles

Full transcriptof different lengths a triangle with 1 right angle that forms a 90° square corner a triangle with

1 obtuse angle

larger than a right angle a triangle with 3 acute angles

smaller than a right angle http://studyjams.scholastic.com/studyjams/jams/math/geometry/classify-triangles.htm http://studyjams.scholastic.com/studyjams/jams/math/geometry/classify-angles.htm Reason with shapes and their attributes.

MCC3.G.1 Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals). Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories. http://rpsec.usca.edu/Classwork/703sp2004/RaceCar/triquiz.htm CC Standard How can you name and sort triangles by their sides and by their angles? Class Quiz 1 *Triangle angles are measured in degrees. the length of its

the size of its How do I know

the names of

triangles? 3 equal sides? 2 equal sides? No equal sides?

What are the SIDES? Exactly 90°? Less than 90°? More than 90°? What

are the ANGLES? Ask yourself these questions. Did you know Triangles

have

names? sides angles Triangles

can have... 3 equal sides

2 equal sides

no equal sides equilateral isosceles scalene right acute obtuse 2" 2" 2" 3" 3" 2" Triangles with Side Names: *Create with Anglegs 3" 5" 4 1/2" Triangles with Angle Names: We are going to name

some triangles today! Triangle names can come from... Hands-on Ticket Out the Door and Triangles Side Angle Triangles