Measurement and Classification of Angles
2012-11-30 03:18
This interactive applet demonstrates how to measure angles using a protractor and classify them into categories like acute, right, and obtuse angles. Users can explore angle formation, learn protractor usage, and understand angle characteristics. It is an excellent tool for introductory geometry, helping students build a solid foundation in angle concepts.
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<objColor r="0" g="0" b="0" alpha="0"/>
<layer val="3"/>
<labelMode val="0"/>
<selectionAllowed val="false"/>
<font serif="false" sizeM="1.4" size="8" style="0"/>
<startPoint x="-3.9400000000000004" y="1.3800000000000012" z="1"/>
</element>
<command name="If">
<input a0="P ≟ A" a1="Line[P, C]"/>
<output a0="L2"/>
</command>
<element type="line" label="L2">
<show object="false" label="true" ev="4"/>
<objColor r="0" g="0" b="0" alpha="0"/>
<layer val="3"/>
<labelMode val="0"/>
<selectionAllowed val="false"/>
<coords x="NaN" y="NaN" z="NaN"/>
<lineStyle thickness="2" type="0" typeHidden="1"/>
<eqnStyle style="implicit"/>
</element>
<command name="ClosestPoint">
<input a0="L2" a1="Q"/>
<output a0="H2"/>
</command>
<element type="point" label="H2">
<show object="false" label="true" ev="4"/>
<objColor r="125" g="125" b="255" alpha="0"/>
<layer val="3"/>
<labelOffset x="-14" y="37"/>
<labelMode val="0"/>
<coords x="NaN" y="NaN" z="NaN"/>
<pointSize val="4"/>
<pointStyle val="0"/>
</element>
<command name="If">
<input a0="P ≟ A" a1="Line[P, B]"/>
<output a0="L1"/>
</command>
<element type="line" label="L1">
<show object="false" label="true"/>
<objColor r="0" g="0" b="0" alpha="0"/>
<layer val="3"/>
<labelMode val="0"/>
<selectionAllowed val="false"/>
<coords x="NaN" y="NaN" z="NaN"/>
<lineStyle thickness="2" type="0" typeHidden="1"/>
<eqnStyle style="implicit"/>
</element>
<command name="ClosestPoint">
<input a0="L1" a1="Q"/>
<output a0="H1"/>
</command>
<element type="point" label="H1">
<show object="false" label="true" ev="4"/>
<objColor r="125" g="125" b="255" alpha="0"/>
<layer val="3"/>
<labelMode val="0"/>
<coords x="NaN" y="NaN" z="NaN"/>
<pointSize val="4"/>
<pointStyle val="0"/>
</element>
<command name="If">
<input a0="(angle > 0°) ∧ (angle < 90°)" a1="1" a2="angle ≟ 90°" a3="2" a4="(angle > 90°) ∧ (angle < 180°)" a5="3" a6="angle ≟ 180°" a7="4" a8="(angle > 180°) ∧ (angle < 270°)" a9="5"/>
<output a0="Cat"/>
</command>
<element type="numeric" label="Cat">
<value val="1"/>
<symbolic val="true" />
<objColor r="0" g="0" b="255" alpha="0.1"/>
<selectionAllowed val="false"/>
</element>
<element type="button" label="buttonReset">
<show object="false" label="true" ev="3"/>
<objColor r="0" g="0" b="0" alpha="0"/>
<layer val="3"/>
<labelOffset x="166" y="561"/>
<labelMode val="0"/>
<fixed val="true"/>
<auxiliary val="true"/>
<ggbscript val="SetBackgroundColor[textCat1,""] SetBackgroundColor[textCat2,""] SetBackgroundColor[textCat3,""] SetBackgroundColor[textCat4,""] SetBackgroundColor[textCat5,""]"/>
<font serif="false" sizeM="2" size="20" style="0"/>
<caption val="reset"/>
</element>
<expression label="textQ" exp=""" + (If[lang ≟ 1, "若正確點撃角的分類，文字的背景會變成黃色", "If the correct answer is clicked, the background will turn yellow."]) + """ />
<element type="text" label="textQ">
<show object="true" label="true" ev="11"/>
<objColor r="96" g="96" b="96" alpha="0"/>
<layer val="1"/>
<labelMode val="0"/>
<selectionAllowed val="false"/>
<font serif="false" sizeM="0.7" size="-6" style="0"/>
<startPoint x="-3.9400000000000004" y="-4.799999999999999" z="1"/>
</element>
</construction>
</geogebra>