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Short answer
A rhombus or kite has area equal to half the product of its diagonals (8 and 6 give 24; 10 and 6 give 30). A semicircle is half of pi r squared, so r = 5 gives 39.27.
1. Formulas
| Shape | Area | Example |
|---|---|---|
| Rhombus | ½ × d₁ × d₂ | 8 and 6: 24 |
| Kite | ½ × d₁ × d₂ | 10 and 6: 30 |
| Semicircle | ½ × πr² | r = 5: 39.27 |
2. Extra facts
- Rhombus with diagonals 8 and 6: each side is 5 (half-diagonals 4 and 3), so the perimeter is 20.
- Semicircle perimeter: πr + 2r, which is 25.71 for r = 5.
3. Use the calculator
Enter the four corners under Irregular polygon, for example 4, 0 / 0, 3 / -4, 0 / 0, -3 for the rhombus. For a semicircle, calculate the circle in the Area Calculator and halve it.
Related: Circle Calculator.
4. Frequently asked questions
What is the area formula for a rhombus?expand_more
Half the product of the diagonals. Diagonals of 8 and 6 give 24.
Is a kite's area the same formula?expand_more
Yes, half the product of the diagonals. 10 and 6 give 30.
How do I find the area of a semicircle?expand_more
Half of pi times r squared. For r = 5 it is 39.27.
Can the calculator do these shapes?expand_more
Yes, through Irregular polygon for rhombus and kite corners, and by halving the circle for a semicircle.