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solution given:

Area of triangle ABC=½b×h=½×18×21=189km²

Area of square DEFG=l²=9²=81km²

Area of rectangle DHIJ=l×b=4×13=52km²

Total area =189+81+52=322 square kilometers.

Step-by-step explanation:

refer the attachment

we have a triangle,a rectangle and a square

in order to figure out the area of the total figure we need to figure out the area the attached figure first

the triangle has a base of 18 km and a height of 13+6+2=21km

thus,

the area of the triangle is

reduce fraction:

simplify multiplication:

the rectangle has a length of 13km and a width of 4km

thus,

the area of the rectangle is

simplify multiplication:

the length of every sides of the square is 9km

thus,

the area of the square is

simplify square:

substitute:

simplify addition:

b, i believe, but not sure.

step-by-step explanation:

for volume, add base x height x width