maths
posted by kelly on .
please can some one help me..?
Part a 
O is the centre of the circle, and P , Q are points on the
circumference of the circle, with the angle POQ being a right angle. The radius of the circle is 3 cm.
Choose the option that is the area of the smaller sector POQ, correct to 3 decimal places.
Options  A) 7.065 cm^2 B) 7.069 cm^2 C) 7.071 cm^2
D) 10.07 cm^2
Part b
Choose the option that is the perimeter of the smaller sector POQ, correct to 3 significant figures. (The perimeter of the sector is the distance around all the edges of the sector.)
Options  A) 7.069 cm B) 7.07 cm C) 10.7 cm D) 10.712 cm
for part a i thinks its 7.069cm squred
but i don't knw what part b is

I got a different answer for Part a. I first figured the area of the complete circle [A = pi(r^2)]. Then I found one fourth of the complete area.
For Part b, you first need the total circumference of the circle. Using the formula C = pi (2r), I get 18.8496 cm. One "side" of the sector then is 18.84/4 = 4.7124.
Add 4.7124 to the other two sides of the sector to find the total perimeter.