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Unformatted text preview: 2 4 0 3 and 4 1 0. 1 5( 4 ) 0 1 2 2 4 0 1 0 1 3) 2( 0 1 2 20 (2 6 0 10 0 26 8) (0 0 0) 10 AREA OF A TRIANGLE The area of a triangle with vertices (x1, y1), (x2, y2), and (x3, y3) is Area 1 2 y (x , y ) 11 (x 2, y2) x1 y1 1 x2 y2 1 x3 y3 1 (x 3, y3) x where the symbol indicates that the appropriate sign should be chosen to yield a positive value. The Area of a Triangle Example 2 The area of the triangle shown is: y ( 1, 3) (3, 2) Area 1 2 1 (0 2 131 001 321 9 0) (0, 0) 3 (0 ( 2) 0) 1 1 1 3x 11 2 Lesson 4.3 • Algebra 2 Notetaking Guide 83 Your Notes Checkpoint Complete the following exerc...
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