math help Working with perimeter and area?

Question

1. The rectangular table has a semicircular leaf at each end.

the wedth is 100 cm and the length is 80 cm thats all it shows

a) What is the total area of the table, in square centimeters?

b) Express the area in square metres.

c) What is the total perimeter of the table, in centimetres?

d) Express the perimeter in metres.

Its only one question with four parts please help and show the work even if you only understand some parts thnx

Answer 1

if this is ur homework, then im not answering


u can't even get that! wat r u a 1st grader?

Answer 2

Table with semicircular leaf width 100cm and length 80cm means :
+the circle radius is 40cm
+there are 20cm x 80cm rectangular in the middle

Area = Circle Area + Rectangle Area
= 3.14 x 40cm x 40cm + 80cm x 20cm
= 5024cm + 1600cm
= 6624cm2 ---> this is a)

For m2 you just have to divide by 10000cm2/m2 so
Area = 6624cm2 / (10000cm2/m2)
= 6624cm2 x 0.0001 m2/cm2
= 0.6624 m2 ---> this is b)

The perimeter is given by this :
Perimeter = Circle Perimeter + 2 x Rectangle Width
= 3.14 x 2 x 40cm + 2 x 20cm
= 251.2 cm + 40 cm
= 291.2 cm ---> this is c)

For m just remember to multiply it by 0.01m/cm so
Perimeter = 291.2cm x 0.01m/cm
= 2.912 m ---> this is d)

Answer 3

a) A = 100*80 + π50^2
A = 8000 + 2500π
A ≈ 15,854 cm^2

b)
A ≈ 1.5854 m^2

c) P = 2*80 + 100π
P ≈ 474.16 cm

d)
P ≈ 4.7416 m

Answer 4

area=100x80=8000
don't know
Perimeter=100+100+80+80=160+200=360!
don't know