Q2 of 52 Page 154

Measure of an arc of a circle is 80 cm and its radius is 18 cm. Find the length of the arc. (π = 3.14)

Measure of an arc of circle, θ = 80°


Radius of circle, r = 18 cm





⇒ Area of sector = 25.12 cm


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3

The circumferences of circular faces of a frustum are 132 cm and 88 cm and its height is 24 cm. To find the curved surface area of the frustum complete the following activity.


Circumference1 = 2πr1 = 132



Circumference2 = 2πr2 = 88



Slant height of frustum,



Curved Surface area of frustum = π(r1 + r2)l


1

Radius of a circle is 10 cm. Measure of an arc of the circle is 54°. Find the area of the sector associated with the arc. (π = 3.14)

 3

Radius of a sector of a circle is 3.5 cm and length of its arc is 2.2 cm. Find the area of the sector.

 4

Radius of a circle is 10 cm. Area of a sector of the sector is 100 cm2. Find the area of its corresponding major sector. (π = 3.14)