Answer:
Step-by-step explanation:
area of sector = {Ф ( in degrees)/360}πr²
Ф = 60
π=3.14
r=10
area = (60/360) x 3.14 x 10²
= (1/6)x3.14 x100 = (1/6)x314= 314/6 = 52.33
The first answer, answer A. It's easy.
A good rule is to change 10 to 15 percent of the water each week. If your tank is heavily stocked, bump that up to 20 percent each week. A lightly stocked aquarium can maybe get by for two to four weeks, but this should be the maximum length of time between water changes.
Answer:
200.96cm^2
Step-by-step explanation:
the circle's diameter is 16cm --> the radius is 8cm
the area of the circle is 8^2 x 3.14 = 200.96 cm^2
