Q.Write an algorithm to calculate area and perimeter of a rectangle, using both pseudocode and flowchart.

Sequential algorithm: read length and breadth once, then apply the two formulas area = length × breadth and perimeter = 2 × (length + breadth).

Step 1: INPUT length
Step 2: INPUT breadth
Step 3: area = length * breadth
Step 4: perimeter = 2 * (length + breadth)
Step 5: PRINT area, perimeter

Flowchart: Start → Input length, breadth (parallelogram) → area = length * breadth (rectangle) → perimeter = 2 * (length + breadth) (rectangle) → Output area, perimeter (parallelogram) → Stop.

length = float(input("Enter length: "))
breadth = float(input("Enter breadth: ")) …

The idea. Like the sum-of-two-numbers example, this needs only the sequence construct: two inputs, two formula evaluations, two outputs. The value of writing it out is practising the input → process → output pattern that every flowchart follows.

Pseudocode:

Step 1: INPUT length
Step 2: INPUT breadth
Step 3: area = length * breadth
Step 4: perimeter = 2 * (length + breadth)
Step 5: PRINT area
Step 6: PRINT perimeter

Flowchart (nodes and arrows):

1. Start (oval)
2. ↓ Input length, breadth (parallelogram)
3. ↓ area = length * breadth (rectangle)
4. ↓ perimeter = 2 * (length + breadth) (rectangle)
5. ↓ Output area, perimeter (parallelogram)
6. ↓ Stop (oval)

Python implementation:

length = float(input("Enter length of rectangle: "))
breadth = float(input("Enter breadth of rectangle: "))
area = length * breadth
perimeter = 2 * (length + breadth)
print("Area =", area)
print("Perimeter =", perimeter)

Expected output (sample run):

Enter length of rectangle: 8 …