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C4>O7

From 2000 SMC:

16. A roll of adhesive tape is wound round a central cylindrical core of radius 3cm. The outer radius of a roll containing 20m or tape is 4cm. Approximately what is the outer radius of a roll containing 80m of tape?

A 5cm B 5.5cm C 6cm D 7cm E 12cm

16. A roll of adhesive tape is wound round a central cylindrical core of radius 3cm. The outer radius of a roll containing 20m or tape is 4cm. Approximately what is the outer radius of a roll containing 80m of tape?

A 5cm B 5.5cm C 6cm D 7cm E 12cm

5.5 right?

The 20m tape is wound round so that the total area of the wound disk is 5pi cm^2. The ratio of 20m to 5pi must be the same for the area of the larger disk and the 80m.

C4>O7

From 2000 SMC:

16. A roll of adhesive tape is wound round a central cylindrical core of radius 3cm. The outer radius of a roll containing 20m or tape is 4cm. Approximately what is the outer radius of a roll containing 80m of tape?

A 5cm B 5.5cm C 6cm D 7cm E 12cm

16. A roll of adhesive tape is wound round a central cylindrical core of radius 3cm. The outer radius of a roll containing 20m or tape is 4cm. Approximately what is the outer radius of a roll containing 80m of tape?

A 5cm B 5.5cm C 6cm D 7cm E 12cm

I got 7...... (But I *usually* trust james so go with him answer!)

JamesF

5.5 right?

The 20m tape is wound round so that the total area of the wound disk is 5pi cm^2. The ratio of 20m to 5pi must be the same for the area of the larger disk and the 80m.

The 20m tape is wound round so that the total area of the wound disk is 5pi cm^2. The ratio of 20m to 5pi must be the same for the area of the larger disk and the 80m.

I think the approach is correct, but i get 6 as an answer :

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can someone please explain what principle domain is and why the answer is a not c?Maths

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