QQuestion
Find the total surface area of a cone whose diameter of the base is 20 cm and slant height is 25 cm.
WBBSEClass 10MathematicsRight Circular Cone02 Mark2022 Easy
✓Answer
Diameter = 20 cm ⇒ radius (r) = 10 cm
Slant height (l) = 25 cm
Total Surface Area (TSA) of cone = πrl + πr²
= π × 10 × 25 + π × 10²
= 250π + 100π
= 350π cm²
TSA = 350 × \frac{22}{7} = 1100 cm²
Was this answer helpful?
Related Questions
More WBBSE Easy level questions
1/12
State True or False: The height, radius, and slant height of a right circular cone are always the three sides of a right-angled triangle.
If the volume of a right circular cone is V cubic unit, the base area is A sq. unit and the height is H unit, then find the value of
If x be the volume, y be the area of the base and z be the height of a cone then the value of x / yz is 3.
If V be the volume, R be the radius of the base and H be the height of a right circular cone, then H = ____
If V be the volume, R be the radius of the base and H be the height of a right circular cone, then H = ____.
In a right circular conical tent, 11 persons can stay. For each person, 4 sq. m space in the base and 20 cu.m. air are necessary. Determine the height of the tent put up exactly for 11 persons.
Curved surface area of a right circular cone is 154√2 sq cm and radius of the base 7 cm. Find its vertical angle.
The height of a right circular cone is twice the radius of the base. If the height were seven times the diameter of the base then the volume of the cone would have been 539 cu cm more. Find the height of the cone.
Asha buys ₹ 20 shares of a company which pays 9% dividend at such a price that she gets a return of 12% on her investment. At what price did she buy each share? (a) ₹ 20 (b) ₹ 15 (c) ₹ 25 (d) ₹ 18
The fourth term of a Geometric Progression (G.P.) is 16 and its seventh term is 128. Find its: (a) common ratio (b) first term
If A = , then A² is equal to: (a) (b) (c) (d)
Statement 1: The point which is equidistant from three non-collinear points D, E and F is the circumcentre of △DEF. Statement 2: The incentre of a triangle is the point where the bisectors of the angles intersect. (a) Both statements are true. (b) Both statements are false. (c) Statement 1 is true and Statement 2 is false. (d) Statement 1 is false and Statement 2 is true.