Altitude Lines and Areas of Triangles
Altitude Lines and Areas of Triangles
Altitude Lines and Areas of Triangles
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7. Finding Area <strong>of</strong> <strong>Triangles</strong> using <strong>Altitude</strong>.notebook<br />
March 19, 2014<br />
<strong>Altitude</strong> <strong>Lines</strong> <strong>and</strong> <strong>Areas</strong> <strong>of</strong> <strong>Triangles</strong><br />
D<br />
Steps for finding the length <strong>of</strong> an altitude CD:<br />
a) Need to find the equation <strong>of</strong> the line CD<br />
find the slope <strong>of</strong> AB, determine its negative reciprocal<br />
then use the negative reciprocal slope along with point C<br />
to find the equation <strong>of</strong> CD<br />
b<br />
Find the equation AB.<br />
c) Find the poi <strong>of</strong> CD <strong>and</strong> AB this will give us point D<br />
d) Use the distance formula <strong>and</strong> points C <strong>and</strong> D to find the length <strong>of</strong><br />
CD<br />
1
7. Finding Area <strong>of</strong> <strong>Triangles</strong> using <strong>Altitude</strong>.notebook<br />
March 19, 2014<br />
A triangle has vertices J(-2, 0), K(4, -3) <strong>and</strong> L(8, 8)<br />
a) Find an equation for the altitude from vertex L to side JK<br />
b) Find the length <strong>of</strong> the altitude.<br />
c) Find the area <strong>of</strong> triangle JKL.<br />
The slope <strong>of</strong> the altitude from L is the negative<br />
reciprocal <strong>of</strong> the slope <strong>of</strong> JK since they are<br />
perpendicular<br />
L(8, 8)<br />
J(-2, 0)<br />
K(4, -3)<br />
2
7. Finding Area <strong>of</strong> <strong>Triangles</strong> using <strong>Altitude</strong>.notebook<br />
March 19, 2014<br />
Mar 191:43 PM<br />
3
7. Finding Area <strong>of</strong> <strong>Triangles</strong> using <strong>Altitude</strong>.notebook<br />
March 19, 2014<br />
Text: pg 120 #1 5,8<br />
Oct 812:30 PM<br />
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