Website for what is the 2d shape resulting from slicing a 3d shape.
https://www.ixl.com/math/geometry/cross-sections-of-three-dimensional-figures



Here is an interactive website to create triangles with different conditions. 
Click on this website and use it to create the triangles on the worksheet.   To start you will have to click the down arrow on the left side to decrease the number of sides on the shape to 3 and a triangle.
 
http://www.mathsisfun.com/geometry/polygons-interactive.html


Video on how to draw triangles using a ruler and protractor.
Watch and practice drawing triangles on the worksheet with a protractor.

https://www.youtube.com/watch?v=BAO9kMxpo60