Patterns are made using straight lines and arcs. a) Pattern A (one row) Pattern B (two rows) (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.