Half Cylinder
1. **State the problem:** Calculate the surface area (excluding the top rectangle) and volume of a half cylinder with radius $r=34$ cm and length $l=0.58$ m. Convert all units to cm.
2. **Convert length to cm:**
$$l = 0.58 \text{ m} = 0.58 \times 100 = 58 \text{ cm}$$
3. **Calculate the curved surface area of the half cylinder:**
The curved surface area of a full cylinder is $2\pi r l$.
For a half cylinder, it is half of that:
$$\text{Curved surface area} = \pi r l = \pi \times 34 \times 58$$
Calculate:
$$\pi \times 34 \times 58 = 3.1416 \times 34 \times 58 = 6193.8 \text{ cm}^2$$
4. **Calculate the flat rectangular side area:**
The flat side is a rectangle with dimensions $l$ by diameter $2r$:
$$\text{Flat side area} = l \times 2r = 58 \times (2 \times 34) = 58 \times 68 = 3944 \text{ cm}^2$$
5. **Calculate total surface area (excluding top rectangle):**
The problem states to exclude the top rectangle, so total surface area is curved surface area plus flat side area:
$$\text{Surface area} = 6193.8 + 3944 = 10137.8 \text{ cm}^2$$
6. **Calculate the volume of the half cylinder:**
Volume of full cylinder:
$$V = \pi r^2 l = \pi \times 34^2 \times 58$$
Calculate:
$$\pi \times 1156 \times 58 = 3.1416 \times 1156 \times 58 = 210460.5 \text{ cm}^3$$
Half cylinder volume is half of that:
$$\text{Volume} = \frac{210460.5}{2} = 105230.25 \text{ cm}^3$$
**Final answers:**
Surface Area = $10137.8$ cm$^2$
Volume = $105230.25$ cm$^3$