Let’s solve each triangle one by one using the formula:
Area = ½ × base × height
We’ll multiply the base and height, then divide by 2. Don’t forget to include the correct units (like cm², in², etc.).
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Problem 1:
Base = 18 cm
Height = 12 cm
Area = ½ × 18 × 12
= 9 × 12
=
108 cm²
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Problem 2:
Base = 33 in
Height = 22 in
Area = ½ × 33 × 22
= 33 × 11
=
363 in²
*(Because half of 22 is 11, so we can do 33 × 11 instead)*
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Problem 3:
Base = 6 m
Height = 9 m
Area = ½ × 6 × 9
= 3 × 9
=
27 m²
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Problem 4:
Base = 11 cm
Height = 13 cm
Area = ½ × 11 × 13
= 5.5 × 13
Let’s calculate: 5 × 13 = 65, 0.5 × 13 = 6.5 → total = 71.5
=
71.5 cm²
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Problem 5:
Base = 7 yd
Height = 5 yd
Area = ½ × 7 × 5
= 3.5 × 5
=
17.5 yd²
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Problem 6:
Base = 4 mm
Height = 9 mm
Area = ½ × 4 × 9
= 2 × 9
=
18 mm²
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Problem 7:
Base = 44 mm
Height = 28 mm
Area = ½ × 44 × 28
= 22 × 28
Let’s break it down: 20 × 28 = 560, 2 × 28 = 56 → total = 616
=
616 mm²
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Problem 8:
Base = 15 in
Height = 8 in
Area = ½ × 15 × 8
= 15 × 4
=
60 in²
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Final Answer:
1. 108 cm²
2. 363 in²
3. 27 m²
4. 71.5 cm²
5. 17.5 yd²
6. 18 mm²
7. 616 mm²
8. 60 in²
Parent Tip: Review the logic above to help your child master the concept of area of triangle worksheet.
