Elementary Maths: Arc length & Sector Areas

• Nathpoop

  1 Sep 09, 19:46

  

             Fig 1.1

  The diagram (Fig 1.1) shows six shaded petals that meet at the centre O of a circle of radius 3cm. The shaded petals are formed by equal arcs of six circles, each of radius 3cm. Find

  (a) the total perimeter of the six petals, Ans: 37.7cm

  (b) the total area of the six petals. Ans: 9.78cm^2

  THANKS IN ADV. AGAIN!

• Ajimal

  1 Sep 09, 21:17

  Erm do you have the answer? I tink the answers are (a)113 cm, (b)170 cm²

  Keep in mind that my answers are probably wrong.

• Nathpoop

  1 Sep 09, 22:07

  Originally posted by Ajimal:

  Erm do you have the answer? I tink the answers are (a)113 cm, (b)170 cm²

  Keep in mind that my answers are probably wrong.

  
  That is what i got too. But it's wrong. ):

• Ajimal

  2 Sep 09, 06:47

  LOL! can u tell me the answers? i can help u try find the answer =)

• Forbiddensinner

  2 Sep 09, 18:42

  Originally posted by Nathpoop:

  

             Fig 1.1

  The diagram (Fig 1.1) shows six shaded petals that meet at the centre O of a circle of radius 3cm. The shaded petals are formed by equal arcs of six circles, each of radius 3cm. Find

  (a) the total perimeter of the six petals, Ans: 37.7cm

  (b) the total area of the six petals. Ans: 9.78cm^2

  THANKS IN ADV. AGAIN!

  Hint No.1 : perimeter of 6 circles =/= perimeter of 6 petals.

  Hint No.2 : Use the entire circle to find the area of the petals.