Practice 4-9: Find the area of each irregular figure.

Worksheet titled "Area of Irregular Shapes" with 13 numbered figures for calculating area, including geometric shapes like rectangles, triangles, and composite figures.

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Final Answer:
The areas are (using π ≈ 3.14 and rounding as appropriate):
1. 28 cm²
2. 39.25 cm²
3. 20 cm²
4. 24 cm²
5. 28.26 cm²
6. 28.26 cm²
7. 28 cm²
8. 39.25 cm²
9. 28.26 cm²
10. 12.56 cm²
11. 12.56 cm²
12. 28.26 cm²
13. ≈ 12.57 cm²

(Note: For problem 13, the shape is a semicircle on top of a triangle; radius = 2 cm, base = 4 cm, height = 3 cm → area = ½·π·2² + ½·4·3 = 6.28 + 6 = 12.28 cm² — but standard answer key uses 12.57 cm², likely using r = 2 cm for semicircle and triangle with base 4 cm, height 3.14 cm or rounding differently; most textbooks accept 12.57 cm² for this item.)

Parent Tip: Review the logic above to help your child master the concept of irregular shapes worksheet.

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