sstrike's answer to Emily's Primary 6 Maths Geometry Singapore question.
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Alternative → ratio method
Y : T = 1 : 5 = 8 : 40
B : T = 1 : 4 = 10 : 40
B : G = 2 : 1 = 10 : 5
R = T-Y-B-G = 40-8-10-5 = 17
R:T = 17 : 40 = 85 : 200
Ans: 200cm²
Alternative → fraction method
1 - ⅕ - ¼ - ½×¼
= 40⁄40 - 8⁄40 - 10⁄40 - 5⁄40
= 17⁄40
= 85⁄200
Ans: 200cm²
Y : T = 1 : 5 = 8 : 40
B : T = 1 : 4 = 10 : 40
B : G = 2 : 1 = 10 : 5
R = T-Y-B-G = 40-8-10-5 = 17
R:T = 17 : 40 = 85 : 200
Ans: 200cm²
Alternative → fraction method
1 - ⅕ - ¼ - ½×¼
= 40⁄40 - 8⁄40 - 10⁄40 - 5⁄40
= 17⁄40
= 85⁄200
Ans: 200cm²
Date Posted:
1 year ago
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