Four mark exercise problems I — task. Mathematics State Board, Class 8.

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For the sectors with given measures, find the length of the arc, area and perimeter.

$\pi = 3.14$

(i) central angle

$45^{\circ}$ ,

$r = 16 \ cm$

Answer:

Length of the arc

$=$

$cm$ (approx.)

Area

$=$

$cm^2$ (approx.)

Perimeter

$=$

$cm$ (approx.)

(ii) central angle

$120^{\circ}$ ,

$d = 12.6 \ cm$

Answer:

Length of the arc

$=$

$cm$ (approx.)

Area

$=$

$cm^2$ (approx.)

Perimeter

$=$

$cm$ (approx.)

(Note: Round off the answers to

$2$ decimal places.)

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