The cross sectional area of the conduit not part of the 7 cables is; 706.5cm²
<h3>What is the cross sectional area of the conduit not part of the 7 cables?</h3>
It follows from the task content that the conduit in discuss has 7 cables all same diameter and has a circular cross section.
Since, the cross sectional area of the conduit not part of the 7 cables is required; it follows that the cross sectional area of the inside cavity can be evaluated as follows;
where radius, r = D/2 = 30/2.
Area = πr² = 3.14 × (30/2)² = 706.5cm²
Read more on area of circular cross section;
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