annulus problem 3:
A garten has a diameter of 8 m.
Around the garden is a way of 40 cm.
Calculate the total walking area!
area:
calculate the small and large radius
radius small (r):
8 m : 2 = 4 m
radius large (R):
small radius + way 40 cm = 0,4 m
4 m + 0.4 m = 4.4 m
answer area
area = π * (R² – r²)
area = π * (4,4² – 4²)
area = 10.56 m²
A: The area of the circle sector is 10.56 square meters.