Patterns are made using straight lines and arcs.
a) Pattern A (one row) Pattern B (two rows)
10:00 000
(2)
More rows are added to Pattern B so that
number of straight lines : number of arcs = 7: 6
How many rows are added?
Your final line must say, ... rows are added to B
b) A different pattern is made using 20 straight lines
and 14 arcs.
The straight lines and arcs are made from metal.
20 straight lines cost £12
cost of one straight line : cost of one arc = 2:3
Work out the total cost of metal in the pattern.
(3)
Total marks: 5