A windscreen wiper sweeps through an angle of $1.4$ radians. The outer end of the blade is $12$

Question

A windscreen wiper sweeps through an angle of $1.4$ radians. The outer end of the blade is $12$ dm from the pivot and the inner end is $8$ dm from the pivot. Calculate the area swept by the blade, giving your answer correct to 3 significant figures.

Accepted Answer

$56\,\text{dm}^2$.

Sec 3/4 E Math T08-Q24 - Area swept by a windscreen wiper

Sec 3/4 E Math T08-Q24 - Area swept by a windscreen wiper

Solution:

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