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A circular tabletop has a diameter of 2.1 m.
a) What is the area?
b) The table is to be painted. One tin of paint can cover an area of 1.75 m² and cost 5.50 dollars.
ii)How any tins of paint must be bought?
iii) How much will it cost for materials and labour is 2/3 the cost of materials?

Respuesta :

devishri1977

Answer:

Step-by-step explanation:

Area of Circle:

    a) Diameter = 2.1 m

                      r = 2.1 ÷ 2 = 1.05 m

            Area   = πr²

                       = 3.14 * 1.05 * 1.05

                      = 3.46 = 3.5 m²

    b) To find the number of paint tins, divide the area of table top by 1.75 m²

     Number of tins =  3.5 ÷ 1.75

                               = 2 tins

c) Cost of 1 tin = $ 5.50

   Cost of 2 tin = 2 *5.50

                        = $ 11

[tex]\sf d) Cost\ of \ labour = \dfrac{2}{3} * 11[/tex]

                         = $ 7.30

Answer:

a=3.46 (2dp)   b(ii)=2  

Step-by-step explanation:

a)

πr²=area

2.1/2 = 1.05 as the radius

1.05² x π= 3.46 (2dp)

b)

3.46/1.75= 1.98

1.98 can be changed into two

∴ 2 tins will be needed

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