Finding Areas of Shapes

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Presentation transcript:

Finding Areas of Shapes

AREA

What is Height?

You must make sure you have perpendicularity! Height A distance that is perpendicular to a base Perpendicular means forming a 90° angle with a side (base) You must make sure you have perpendicularity!

Height of a Triangle The height of a triangle Select two vertices Call the line segment joining these two vertices the base Find the third vertex Draw a segment from the third vertex to the base *What if you had selected two different vertices?

Shape Cutter Tool https://illuminations.nctm.org/Activity.aspx?id=4206

What are some of the characteristics of a rectangle?

What are some of the characteristics of a parallelogram?

Why Does That Work? Exchanging Repurposing Recycling Reusing What is happening to the area of the figure we are “cutting off”? Exchanging Repurposing Recycling Reusing

http://thinkmath.edc.org/resource/measurement-discovering-formulas-area

http://thinkmath.edc.org/resource/measurement-discovering-formulas-area

http://thinkmath.edc.org/resource/measurement-discovering-formulas-area

What are some of the characteristics of a trapezoid?

http://thinkmath.edc.org/resource/measurement-discovering-formulas-area

http://thinkmath.edc.org/resource/measurement-discovering-formulas-area