May 18, 2015

Students find the perimeter of a triangle in the coordinate plane using the distance formula.

Students state and apply the formula for area of a triangle with vertices (0,0),(x1, y1), and (x2 , y2).

Teacher and Student versions of full lesson from engageNY

- Mathematics > General
- Mathematics > Geometry

- Grade 9
- Grade 10

Make sense of problems and persevere in solving them.

Reason abstractly and quantitatively.

Model with mathematics.

Use appropriate tools strategically.

Attend to precision.

Look for and make use of structure.

Use coordinates to compute perimeters of polygons and areas of triangles and rectangles, e.g., using the distance formula.?