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primary 5 | Maths
| Area & Volume
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Pls help
Date Posted: 2 years ago
Views: 488
12-5 = 7【side of center small square】
2×5×12+7×7 = 169 = 13×13
4×13 = 52 cm (Ans)
2×5×12+7×7 = 169 = 13×13
4×13 = 52 cm (Ans)
P5 has not learnt square and square root yet.
See my working.
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Date Posted:
2 years ago
ur question's working/ans is in the comment
Even P5 not learn square / square root
7²=7×7=49 (times table)
160=13×13 (guess & check)
Even P5 not learn square / square root
7²=7×7=49 (times table)
160=13×13 (guess & check)
Easy.
Area of 4 triangles = 4 × ½ × base × height
= 2 × 5cm × 12cm
= 120cm²
Length of inner square = 12cm - 5cm = 7cm
Area of inner square = 7cm × 7cm = 49cm²
Total area = 49cm² + 120cm² = 169cm²
Length of big square = √169 cm = 13 cm
OR
169cm² = 13cm × 13cm . Since square has all 4 sides equal in length and area of square = length × length, the length is 13cm.
Perimeter = 13cm × 4 = 52cm
Area of 4 triangles = 4 × ½ × base × height
= 2 × 5cm × 12cm
= 120cm²
Length of inner square = 12cm - 5cm = 7cm
Area of inner square = 7cm × 7cm = 49cm²
Total area = 49cm² + 120cm² = 169cm²
Length of big square = √169 cm = 13 cm
OR
169cm² = 13cm × 13cm . Since square has all 4 sides equal in length and area of square = length × length, the length is 13cm.
Perimeter = 13cm × 4 = 52cm
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