Let’s solve each triangle area problem step by step using the formula:
Area = ½ × base × height
We’ll go one by one.
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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
First, 33 × 22 = 726
Then, 726 ÷ 2 =
363 in²
*(Alternatively: ½ × 33 = 16.5; 16.5 × 22 = 363 — same result)*
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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
11 × 13 = 143
143 ÷ 2 =
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
First, 44 × 28:
40×28 = 1120, 4×28=112 → total 1232
Then, 1232 ÷ 2 =
616 mm²
*(Or: ½ × 44 = 22; 22 × 28 = 616 — same)*
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Problem 8:
Base = 15 in, Height = 8 in
Area = ½ × 15 × 8
= 7.5 × 8
=
60 in²
*(Or: 15 × 8 = 120; 120 ÷ 2 = 60 — same)*
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✔ All calculations double-checked.
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 finding area of triangle worksheet.
