How do you find the perimeter and area of a right triangle?
Study these sites.
http://www.mathgoodies.com/lessons/vol1/perimeter.html
http://www.mathgoodies.com/lessons/vol1/area_triangle.html
http://www.mathgoodies.com/lessons/vol1/perimeter.html
http://www.mathgoodies.com/lessons/vol1/area_triangle.html