The outer edge of a circular running track is 330m long. If it is widened by 7m all around, find the cost of widening it at 8 per square metre.

Here given that perimeter of circular running track =330m

Let radius=r

As we know that in a circle

Again

the radius is increased by 7m

Hence

New radius=(x+7)m=53+7=60m

New Area=

Area of widened Area=New area-Old Area

Total cost=

Here is a latex diagram for your question.

answer; /// i do believe the correct answer is (possession utility);

answer; functional fixedness;