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primary 6 | Maths
| Data Analysis
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Date Posted: 5 years ago
Views: 493
a) Notice that the width of the cardboard fits the circle exactly.
So diameter of 1 circle = 25cm
Length of cardboard = 3m = 300cm
300cm ÷ 25cm = 12
12 circles can be cut.
b) Area of 12 circles = 12πr²
= 12 x 3.14 x (25cm ÷ 2)²
= 12 x 3.14 x 12.5cm x 12.5cm
= 5887.5cm²
Area of cardboard
= 300cm x 25cm
= 7500cm²
Area left after cutting out the circles
= 7500cm² - 5887.5cm²
= 1612.5cm²
So diameter of 1 circle = 25cm
Length of cardboard = 3m = 300cm
300cm ÷ 25cm = 12
12 circles can be cut.
b) Area of 12 circles = 12πr²
= 12 x 3.14 x (25cm ÷ 2)²
= 12 x 3.14 x 12.5cm x 12.5cm
= 5887.5cm²
Area of cardboard
= 300cm x 25cm
= 7500cm²
Area left after cutting out the circles
= 7500cm² - 5887.5cm²
= 1612.5cm²
Thank you for the answers. Appreciate much.
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