A small indoor green house (herbarium) is made entirely of glass panes (including base) held together with tape. The dimensions of the green house are `40cm xx 30cm xx 25cm`. Find:
the area of the glass used

Answer

To find the area of the glass used in the greenhouse (herbarium), we need to calculate the total surface area of the cuboid. The dimensions of the greenhouse are given as:

- Length (l) = 40 cm
- Breadth (b) = 30 cm
- Height (h) = 25 cm

### Step-by-step Solution:

1. **Identify the formula for the total surface area of a cuboid**:
The total surface area (SA) of a cuboid is given by the formula:
\[ SA = 2(lb + lh + bh) \]
where:
- \( l \) = length
- \( b \) = breadth
- \( h \) = height

2. **Substitute the values into the formula**:
Now, substituting the given dimensions into the formula:
\[ SA = 2(40 \times 30 + 40 \times 25 + 30 \times 25) \]

3. **Calculate each term inside the parentheses**:
- First term: \( 40 \times 30 = 1200 \)
- Second term: \( 40 \times 25 = 1000 \)
- Third term: \( 30 \times 25 = 750 \)

4. **Add the results from step 3**:
Now, add these values together:
\[ 1200 + 1000 + 750 = 2950 \]

5. **Multiply by 2**:
Finally, multiply the sum by 2 to find the total surface area:
\[ SA = 2 \times 2950 = 5900 \text{ cm}^2 \]

### Final Answer:
The area of the glass used in the greenhouse is \( 5900 \text{ cm}^2 \).

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