Answer:
Area = 56.549 cm^2
Step-by-step explanation:
To find the area, simply create a ratio for the portion of the shaded region to the area of a complete circle.
The area of a whole circle is A = πr^2. Note, the sum of degrees of a circle is 360. With this in mind, we can create our ratio.
A = (80/360)πr^2
A = (80/360)π(9cm)^2
A = 56.549 cm^2
Answer: 56.52
Step-by-step explanation: first we have to find the are of the circle. We can use the formula:
A=πr²
We can use 3.14 for π and 9 for radius and write our new equation A=3.14*81
We get area= 254.34 cm
Then we need to find the area of the shaded. 80 degrees is 2/9 of 360 degrees. So the shaded area is 2/9 of the total area.
Using this we can make an equation: 254.34*2/9= 56.52
3 and 8 is a pair of corresponding.
1.8m²
∅= 51× π/180 = 17π/60
area of sector= 1/2 × r²× ∅
= 1/2 × 2²× 17π/60
= 34π/60
= 1.78m²
