Question

find the area of a 30 degree circle r or d. round to the nearist whole number.

1.r=2m
2.r=35in.
3.d=50cm
4.d=10ft.



CAN YOU PLEASE HELP ME!!!!!!!!!

Answer 1

A=r^2*pi

A=d^2*pi/4

30°/360°=30°/(12*30°)=1/12

A1= area of a 30°degree circle

A1=r^2*pi/12=0.2618*r^2

A1=(d^2*pi/4)/12=d^2*pi/48=0.06545d^2

1. r=2m

A1=0.2618*r^2=02618*2^2=0.2618*4=1.0472m^2

rounded A1=1 m^2

2. r=35in

A1=0.2618*r^2=A1=0.2618*35^2=A1=0.2618*1225=320.705in^2

rounded A1=321 in^2

3. d=50cm

A1=0.06545d^2=0.06545*50^2=0.06545*2500=163.625cm^2

rounded A1=164 cm^2

4. d=10ft

A1=0.06545d^2=A1=0.06545*10^2=A1=0.06545*100=6.545ft^^2

rounded A1=7 ft^^2