Let’s solve each triangle one by one.
Remember: The area of a triangle is always
½ × base × height.
The height must be perpendicular to the base (look for the right angle symbol).
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Problem 1:
Base = 8 ft, Height = 2 ft
Area = ½ × 8 × 2 = 4 × 2 =
8 ft²
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Problem 2:
Base = 11 m, Height = 9 m
Area = ½ × 11 × 9 = 5.5 × 9 =
49.5 m²
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Problem 3:
Base = 19 ft, Height = 13 ft
Area = ½ × 19 × 13 = 9.5 × 13
Let’s calculate: 9 × 13 = 117, 0.5 × 13 = 6.5 → 117 + 6.5 =
123.5 ft²
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Problem 4:
Base = 36 m, Height = 27 m
Area = ½ × 36 × 27 = 18 × 27
Calculate: 18 × 20 = 360, 18 × 7 = 126 → 360 + 126 =
486 m²
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Problem 5:
Base = 5 cm, Height = 6 cm
Area = ½ × 5 × 6 = 2.5 × 6 =
15 cm²
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Problem 6:
Base = 33 m, Height = 11 m
Area = ½ × 33 × 11 = 16.5 × 11
Calculate: 16 × 11 = 176, 0.5 × 11 = 5.5 → 176 + 5.5 =
181.5 m²
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Problem 7:
Base = 27 cm, Height = 9 cm
Area = ½ × 27 × 9 = 13.5 × 9
Calculate: 13 × 9 = 117, 0.5 × 9 = 4.5 → 117 + 4.5 =
121.5 cm²
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Problem 8:
Base = 3 m, Height = 16 m
Area = ½ × 3 × 16 = 1.5 × 16 =
24 m²
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Final Answer:
1. 8 ft²
2. 49.5 m²
3. 123.5 ft²
4. 486 m²
5. 15 cm²
6. 181.5 m²
7. 121.5 cm²
8. 24 m²
Parent Tip: Review the logic above to help your child master the concept of area of a triangle worksheet 5th grade.
