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Question
primary 5 | Maths
| Fractions
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Date Posted: 2 years ago
Views: 316
just use area of big triangle minus area of small triangle. (1/2 * 18 * 9) - (1/2 * 18 * 4)
Area of triangle= 1/2 x base x height
Shaded triangle
= Big triangle - Small triangle
= 1/2 x 18 x (5+4) - 1/2 x 18 x 4
= 45 cm^2
Shaded triangle
= Big triangle - Small triangle
= 1/2 x 18 x (5+4) - 1/2 x 18 x 4
= 45 cm^2
See 1 Answer
2 working...
1. Big triangle - Small triangle
Big Triangle area
= ½ × 18 × 9
= 81
Small triangle
=½ × 18 × 4
= 36
Shaded area
= 81 - 36
= 45cm²
2. ½ x 18 × (9-4) = 45 cm²
1. Big triangle - Small triangle
Big Triangle area
= ½ × 18 × 9
= 81
Small triangle
=½ × 18 × 4
= 36
Shaded area
= 81 - 36
= 45cm²
2. ½ x 18 × (9-4) = 45 cm²
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