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primary 6 | Maths
| Measurement
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Date Posted: 3 years ago
Views: 227
310÷2－115
Realise that all the shorter vertical sides on the left side add up to a total of 115 cm as well.
i.e their sum equals the length of AB.
Perimeter = 3.1m = 310 cm
All the shorter horizontal sides add up to a total of 1 side of the biggest square.
i.e their sum equals the length of BC.
So 310 cm = AB + BC + sum of all the shorter horizontal sides + sum of all the shorter vertical sides
310 cm = AB + BC + AB + BC
310 cm = AB + 115cm + AB + 115 cm
310 cm = 2AB + 230cm
So,
2AB = 310 cm - 230 cm
2AB = 80 cm
AB = 80 cm ÷ 2 = 40 cm
i.e their sum equals the length of AB.
Perimeter = 3.1m = 310 cm
All the shorter horizontal sides add up to a total of 1 side of the biggest square.
i.e their sum equals the length of BC.
So 310 cm = AB + BC + sum of all the shorter horizontal sides + sum of all the shorter vertical sides
310 cm = AB + BC + AB + BC
310 cm = AB + 115cm + AB + 115 cm
310 cm = 2AB + 230cm
So,
2AB = 310 cm - 230 cm
2AB = 80 cm
AB = 80 cm ÷ 2 = 40 cm
See 1 Answer
1.15 x 2 = 2.3m
3.1- 2.3 = 0.8
0.8 ➗2 = 0.4m
Ans:- 0.4m
3.1- 2.3 = 0.8
0.8 ➗2 = 0.4m
Ans:- 0.4m
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