I dont know how to findthe height but the numbers for all the sides is QR = 7.6 PR = 10.3 PQ = 11.1 and from there just figure out the height and do 1/2bh
He taught himself math, and was a maker of almanacs, an astronomer, and an author. Need to know more? Go here : http://www.biography.com/people/benjamin-banneker-9198038
