Exam review : Circles

300 ugly kids were asked what is their favorite color. how many like blue? how many like green? how many like gold?

Blue: 75 kids

Green:90 kids

Gold:135 kids

What is the estimated ratio of circumference to diameter? 3.14:1

Find the circumference when the radius is 6cm/

R=D simplified formula > C=2 3.14 r

2(6)=d

12=d

C=3.14D

C=3.14(12)

C=37.68cm

Find area when diameter is 10m

R=d/2

R=10/2

R=5

A=3.14 r squared

A=3.14 5 squared

A=78.54 squared

The measure of a sector is 20% of the data. what is the central angle for this sector?

20% of 360

0.2 x 360=72 degrees

I have a pool with a radius of 6m. my yard is 30m by 15m. how much space do i have left in my yard

A yard=l x w r=pi r squared how much left= 450m squared - 113.10=336.9

= 15 x 30 r=113.10

= 450m squared

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