In January 2021, people were allowed to travel 5 km from their home to exercise - Junior Cycle Mathematics - Question 12 - 2022
Question 12
In January 2021, people were allowed to travel 5 km from their home to exercise.
(a) Write km or km² into each box below to complete the following sentence correctl... show full transcript
Worked Solution & Example Answer:In January 2021, people were allowed to travel 5 km from their home to exercise - Junior Cycle Mathematics - Question 12 - 2022
Step 1
Write km or km² into each box below to complete the following sentence correctly.
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Answer
Area is measured in km² and distance is measured in km.
Step 2
Use the following formula to work out the circumference of a circle with a radius of 5 km.
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Answer
Using the formula for circumference:
2×π×r=2×π×5=31.4 km
Step 3
Use a different formula to work out the area of a circle with a radius of 5 km.
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Answer
Using the formula for area:
A=πr2=π(52)=π×25≈78.5 km2
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