9. Find the cost of cultivating a rectangular field 35 m long and 18 m wide at Rs.20 per square metre. Also, find the cost of fencing the field at 15 per metre.

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we know that

1) the inscribed angle measures half of the arc it comprises.

so

m∠dgf= > expression

2) the opposite angles in an inscribed quadrilateral are supplementary angles

so

m∠dgf=

m∠dgf=°

substitute in the expression to find the value of arc ef

therefore

the answer is

the measure of the arc ef is

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