Draw an example of a triangle that has an area of 20 square units. show that your triangle has this area

Illustrative Mathematics

Solution Answers may vary. 

Techniques include "completing" the triangle with sides of length 4 and 10 and arguing that half of its area must be 20 square units, chopping off and relocating a chunk of the right triangle to create a rectangle whose area is 20 square units, and "completing" individual unit squares to create a total of 20 unit squares.

Hope this helps

For the base u could use 10 and the height 4 becuz the area of a triangle is .5bh