What is the radius of a cone made from a quadrant of a circle of radius 28cm.
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Radius of the quadrant of the circle = 28 cm
CSA of the cone = Area of the quadrant of the circle
Area of the quadrant of the circle = 1 4 × 22 7 × 28 × 28 = 616 cm2
∴ CSA of the cone = 616 cm2
CSA of the cone = πrl, where r is the radius and l is the slant height of the cone
Radius of the quadrant of the circle = Slant height of the cone
CSA = 22 7 × r × 28
⇒ 22 7 × r × 28 = 616
⇒ r = 7
∴ Radius of the cone = 7 cm
CSA of the cone = Area of the quadrant of the circle
Area of the quadrant of the circle = 1 4 × 22 7 × 28 × 28 = 616 cm2
∴ CSA of the cone = 616 cm2
CSA of the cone = πrl, where r is the radius and l is the slant height of the cone
Radius of the quadrant of the circle = Slant height of the cone
CSA = 22 7 × r × 28
⇒ 22 7 × r × 28 = 616
⇒ r = 7
∴ Radius of the cone = 7 cm
priyankadas9905:
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