Haynes Kirk
05/22/2023 · Middle School
A piece of wire of length 80 cm is bent into the shape of a circle. When the wire is heated, its length increases at a rate of 0.2 cm s . (a) Hitung kadar perubahan jejari bulatan itu. Calculate the rate of change of the radius of the circle. [b) marks] (beterusnya, hitung jejari bulatan itu selepas wayar itu dipanaskan selama 4 saat. [4ence, calculate the radius of the circle after the wire is heated for 4 seconds. [4 marks] [Guna/Use \( \pi=3.142] \) Jawapan / Answer:
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(a) The rate of change of the radius is about \( 0.0318 \) cm/s.
(b) The radius after 4 seconds is about \( 12.857 \) cm.
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