Answer:
top=170mm squared
shape 2=76.27 cm squared
shape 3=62.862 cm squared
Step-by-step explanation:
top shape...
(18x15)-4(5x5)=area
270-4(25)=area
270-100=area
170=area
shape 2...
diameter of circle is 6 so radius is 3...
area=pier^2
a=28.27 and their are two half circles so that makes one whole circle
(8x6)+28.27=76.27 cm squared
shape 3...
total of rectangle with a half circle subtracted. r=4 d=8
so
11x8=88 for rectangle then subtract half circle
a=pie r^2
a=50.27
50.27/2=25.135 subtract this from rectangle total...
88-25.135=62.862 cm squared