Hi, i'm struggling with these areas & perimeters.

as shown below i have input my answers - though they are wrong.

i need 75% to pass the test and am currently achieving 72% so i ideally need to correct only one of these.

any would be greatly appreciated!

you so much!

1)

V=(3.14)(40^2)(1.3)

V=(3.14)(1600)(1.3)

V=5024(1.3)

V=6531.2

2)

Circumference of semicircle: (2*3.14*17)/2=53.38

CM to M: 4000/100=40, 700/100=7

40+10+7+34+53.38+33+68+10=255.35

Perimeter=255.35m

Area of semicircle: (3.14*17^2)/2=453.73

40*10=400m^2

68*33=2244m^2

400+2244+453.73=3097.73

Area=3097.73m^2

3)

100*75=7500

Area of semicircle: (3.14*25^2)/2=981.25

7500-981.25=6518.75

Area of car park not including the arena=6518.75m^2

4)

Meters to Centimeters: 0.4*100=40

45*40*50=90000

Centimeters to Meters: 90000/100=900

Volume=900m^3