A circular truck has radius 3.5cm. Find the a) circumference b) Area c) diameter 2. The figure below is a rectangle

$$C = 2 \times \frac{22}{7} \times \frac{7}{2}\, \text{cm}$$ $$C = 22\, \text{cm}$$

The circumference is $\boxed{\text{22 cm}}$.

b) Area

$$A = \frac{22}{7} \times (3.5 \times 3.5)\, \text{cm}^2$$ $$A = \frac{22}{7} \times 12.25\, \text{cm}^2$$ $$A = 38.5\, \text{cm}^2$$

The area is $\boxed{\text{38.5 cm}^2}$.

c) Diameter

$$d = 7\, \text{cm}$$

The diameter is $\boxed{\text{7 cm}}$.

2. The figure below is a rectangle with length 3.5 cm and width 2.5 cm. Find:

a) Perimeter

$$P = 2(6.0\, \text{cm})$$ $$P = 12.0\, \text{cm}$$

The perimeter is $\boxed{\text{12.0 cm}}$.

b) Area

$$A = 8.75\, \text{cm}^2$$

The area is $\boxed{\text{8.75 cm}^2}$.