1/3 × 96 = 32cm
If 2 triangles r identical, both will hav height = 36cm.
Area of 2 triangles = 2 × 1/2 × 96 × 32 = 1 (96 × 32)
Area of rectangle = 2 (96 × 32)
Shaded area = 1 (96 × 32) = 3072cm2
6 years ago
Vin Ong
Hihi, would like to understand why area of the rectangle is 2 (96x32)? Isnt area of rectangle/square is length x breadth? Cheers 😊
6 years ago
Pang Shing Hsiu
2x32= 64 = breadth of e rectangle.
I chunk it for easier calculation when u subtract frm area of 2 triangles.
6 years ago
Vin Ong
Thanks a lot😊
6 years ago
Tracy Tan SG
Thank you.
6 years ago
Yeo See Yeong
How do we know the breadth of rectangle is 2x32? It is possible that breadth is less than 64, if height of triangle go pass the midway point of breadth of rectangle?
6 years ago
Pang Shing Hsiu
Identical triangles = equal height? No?
6 years ago
Yeo See Yeong
Question didn't mention point E and F are mid point of the breadth. Or am I missing out something?
6 years ago
Chong Ji Lian
I also don't understand the reasoning for the area of the rectangle.
6 years ago
KL Gan
The reasoning for the height of rectangle does not seem correct. The question never mention height of triangle was midpoint of rectangle height
6 years ago
Ng Siewkhim
Asked 9 years ago
SG
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Primary 3
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Number and Algebra
'k' question?? I have been training my son.in p2 on these type of questions. I feel these questions can help.him build up his model drawing and undeestanding. Just my 2 cents worth of rant
6 years ago
Eunice Tee
6 years ago
Eunice Tee
My daughter school practice a lot of this kind question. Common in P2. Teacher won't teach them algebra, but exam accept algebra working.
6 years ago
Ellis Teh
i use the model to guide him. want him to otally understand the basis of model drawing.
6 years ago
Shahul Hamid
Model drawing is actually algebra. Just replace the x with a box / rectangle. Teaching model drawing in primary schools early is to lay the foundations for the study of algebra later on. It is just meant to show x in pictorial form.
6 years ago
Christmas Chua
1unit=42
4unit=42x4=168
6 years ago
Adrian Ng
Asked 9 years ago
SG
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Primary 5
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Number and Algebra