Question 3

(a)       Candidates were expected to:

1. draw the horizontal centre line and locate centres O1 and O2 100 apart;
2. draw the vertical centre lines through O1 and O2;
3. draw circles R32 and R44;
4.  locate and indicate centre of upper arc (R108, R96) and draw the arc R;
5. locate and indicate centre of lower arc (R82, R94)and draw the arc R50;
6. indicate the points of tangency W, X, Y, Z;
7. draw full size;
8. draw neatly.

 

The solution is shown below.

 

 

 

 

 

 

            (3)       (b)       Candidates were expected to:

1. draw the square ABCE side 25;
2. extend the sides at A, B, C, and D respectively;
3. mark off A1 = 25, B2 = 50, C3 = 75 and D4 = 100

respectively on the extended lines;

1. join points D, 1, 2, 3  and 4 into a smooth curve;
2. draw neatly.

 

The solution is shown below.