Answer:
option (4)
Step-by-step explanation:
Calculate the length using the distance formula
d = 
with (x₁, y₁ ) = A(2, 2) and (x₂, y₂ ) = B(- 6, 4)
AB = 
= 
= 
= 
≈ 8.25 ( to 2 dec. places )
Step-by-step explanation:
the circumference of a circle is
2×pi×r
with r being the radius, which is always half of the diameter.
r = 1.8 / 2 = 0.9 cm
circumference :
2×pi×0.9 = 1.8×pi = 1.8 × 3.142 = 5.6556 cm ≈ 5.7 cm
K is approx 2.57 using a calculator and trying different answers can, in certain situations be useful