1. (a) The diameter is 9 cm.

(b) All of the angles are 60^{o}.

(c) The longest side is 5 cm long.

2. (c) The longest side can never be greater than the sum of the two shortest sides.

3. Constructions

4. Constructions

5. Check that your constructions are correct by checking the measurements in **bold**.

a |
b |
c |

6. (d) AC = 6.0 cm

(e) The triangle is an equilateral triangle.

7. The angles are 80^{o}, 57^{o} and 43^{o}.

8. PR = 6.2 cm

9. a. angle C = 52^{o}

b.BC = 6.2 cm and AC = 6.5 cm

10.