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Grade 9 Math Topic-Surface Area And Volumes

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Published in: Mathematics
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In this ppt i am introducing the formulas and problems related to surface Area of Right circular cone ,Sphere ,Hemisphere.

Ashima F / Al Wakrah

6 years of teaching experience

Qualification: B.Tech.(ECE)

Teaches: Mathematics

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  1. volume surface Area
  2. RIGHT CIRCULAR CONE Slant height (l) Vertex Altitude (h) Radius (r) Curved surface area A = Irrl Area of circular base A = mr2 h base Curved Surface Area A = ltrl Total Surface Area
  3. Example 1: curved surface area Find the curved surface area of the cone below, with radius 3crn and slant height 7crn. Write your answer to I decimal place. 7cm NOT to scale Work out the area of each face. We only need to calculate the area of the curved surface for this question. Curved surface area 21m
  4. SPHERE HEMISPHERE
  5. Surface Area of a Sphere The surface area of a sphere is the area which covers the outer surface of a sphere, raditÄ— The formula for the surface area of a sphere with radius r is: 2 Surface area 4m
  6. Surface Area Of A Hemisphere The surface area of a hemisphere is the area which covers the outer surface of a hemisphere. A hemisphere is half of a sphere. The radius of the hemisphere is r. A hemisphere is a three-dimensional object. 2 Curved surface area = 2rr Total surface area = 3rr2
  7. Find the total surface area of a hemisphere of radius 10 cm. (Use 3.14) The radius of the hemisphere, r = IOcm Total Surface area = 3Ttr2 = 3 x 3.14 x IOcm x IOcm - 942 cm2 The total surface area of the hemisphere is 942 cm2. r = 10cm

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