What is the base of a triangle that has a height of 6 centimeters and an area of 18 centimeters? Use the formula h = StartFraction 2 A Over b EndFraction, where A represents the area of the triangle, h represents the height, and b represents the length of the base.

6cm

Step-by-step explanation:

Height of the triangle = 6cm

Area = 18cm

Base = Unknown

Area of a triangle= (base × height)/2

18 = (base × 6)/2

18 × 2 = base × 6

36 = base × 6

Base = 36/6

Base = 6cm

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2