A tan is shaped as a sector of a circle radius 12cm with the angle 110 at the centre calculate the area of the fan

≈ 138.2 cm²

Step-by-step explanation:

The area (A) of the sector of the circle is calculated as

A = area of circle × fraction of circle

   = πr² ×

   = π × 12² ×

   = 144π ×

   = ≈ 138.2 cm² ( to 2 dec. places )

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

b i think

step-by-step explanation:

not really sure