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primary 5 | Maths
| Fractions
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Hi. Pls help and explain. Thanks
Date Posted: 4 years ago
Views: 390
Area A + Area B = 60cm²
Area A - Area B = 30cm²
(Based on diagram we know A is bigger than B)
If you add 30cm² to the 60cm², you can change the Area B into Area A. Then you will have 2 times of Area A.
30cm² + 60cm² = 90 cm²
90cm² = 2 x Area A
Area A = 90cm² ÷ 2 = 45cm²
Triangle Area formula : ½ x base x height
Triangle A has height of 9cm
Area A = 45cm² = ½ x base x 9cm
Multiply both sides by 2,
45cm² x 2 = 2 x ½ x base x 9cm
90cm² = base x 9cm
base = 90cm² ÷ 9cm
= 10cm
Area A - Area B = 30cm²
(Based on diagram we know A is bigger than B)
If you add 30cm² to the 60cm², you can change the Area B into Area A. Then you will have 2 times of Area A.
30cm² + 60cm² = 90 cm²
90cm² = 2 x Area A
Area A = 90cm² ÷ 2 = 45cm²
Triangle Area formula : ½ x base x height
Triangle A has height of 9cm
Area A = 45cm² = ½ x base x 9cm
Multiply both sides by 2,
45cm² x 2 = 2 x ½ x base x 9cm
90cm² = base x 9cm
base = 90cm² ÷ 9cm
= 10cm
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Date Posted:
4 years ago
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