a sector if a circle of radius 7cm subtending an angle 270 at the centre of a circle is used to used to form a cone . calculate the total surface area of the cone
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area of a circle =πr²
since the circle is cut to make a cone such that the sector makes an angle 270° at the centre and radius is 7 cm
area of the cone= 270/360 ×π×7²
=3/4×22/7×7×7
=3/4×22×7
=115.5cm²
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