How much material is needed to make a triangular flag with base 2 1/4 and height 8 1/2

Amount of material = area

area of triangle=1/2 times base tiems ehighte

base=2 and 1/4

height=8 and 1/2

convert all to imporpoert

2 and 1/4=2+1/4=8/4+1/4=9/4

8 and 1/2=8+1/2=16/2+1/2=17/2

so we have

area=1/2 times 9/4 times 17/2

area = (1 times 9 times 17) / (2 times 4 times 2)

area=153/16

area=9 and 9/16

answer is 9 and 9/16 square units of material