Answer:
See below
Step-by-step explanation:
a) line marked a is tangent
b) line marked b is radius
c) line marked c is diameter
d) line marked d is chord
They will have to buy all three items again in 9 years
SinB = cosC = AC / BC = 8/10 = 4/5;
tgB = ctg C = AC/AB = 8/6 = 4/3, because we use T. Pitagora for calculating AB;
sinC = cosB = AB/ BC = 6/10 = 3/5;
tgC = ctgB = AB/ AC = 6/8 = 3/4.
It has to be true because
