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Slide show Mathematics Exercise 13 Surface Area and Volume Topic on On
Surface Area and Volume Vocabulary & Formulas
Prism Definition: A threedimensional solid that has two congruent and parallel faces that are polygons. The remaining faces are rectangles. Prisms are named by their faces.
Rectangular Prism Definition: A threedimensional solid that has two congruent and parallel faces that are rectangles. The remaining faces are rectangles.
Cube Definition: A rectangular prism in which all faces are congruent squares.
Surface Area Definition: The sum of the areas of all of the faces of a threedimensional figure. Ex. How much construction paper will I need to fit on the outside of the shape?
Volume Definition: The measure in cubic units of the interior of a solid figure; or the space enclosed by a solid figure. Ex. How much sand will it hold?
Surface Area of a Rectangular Prism Ex: How much construction paper would I need to fit on the outside of a particular rectangular prism? Formula: S.A. = 2LW + 2Lh + 2Wh
Surface Area of a Cube Ex: How much construction paper would I need to fit on the outside of a particular cube? Formula: S.A. = 6s2
Volume of a Rectangular Prism Ex: How much sand would I need to fill the inside of a particular rectangular prism? Formula: V = L*W*h
Volume of a Cube Ex: How much sand would I need to fill the inside of a particular cube? Formula: V = s3
Surface area and volume of different Geometrical Figures Cube Parallelopiped Cylinder Cone
Total faces = 6 ( Here three faces are visible) Faces of cube
Faces of Parallelopiped Total faces = 6 ( Here only three faces are visible.)
Total cores = 12 ( Here only 9 cores are visible) Cores Note Same is in the case in parallelopiped.
Surface area = Area of all six faces = 6a2 a b Surface area Cube Parallelopiped Surface area = Area of all six faces = 2(axb + bxc +cxa) c a a a Click to see the faces of parallelopiped. (Here all the faces are square) (Here all the faces are rectangular)
Area of base (square) = a x b a Height of cube = c Volume of cube = Area of base x height = (a x b) x c Volume of Parallelopiped Click to animate
Volume of Cube Area of base (square) = a2 Height of cube = a Volume of cube = Area of base x height = a2 x a = a3 Click to see (unit)3
Circumference of circle = 2 π r Area covered by cylinder = Surface area of of cylinder = (2 π r) x( h) Outer Curved Surface area of cylinder Activity : Keep bangles of same radius one over another. It will form a cylinder. It is the area covered by the outer surface of a cylinder. Formation of Cylinder by bangles Circumference of circle = 2 π r Click to animate
Total Surface area of a solid cylinder =(2 π r) x( h) + 2 π r2 Area of curved surface + area of two circular surfaces = = 2 π r( h+ r)
Surface area of cylinder = Area of rectangle= 2 πrh Other method of Finding Surface area of cylinder with the help of paper
Volume of cylinder Volume of cylinder = Area of base x vertical height = π r2 xh
Cone
3( V ) = π r2h r h h r Volume of a Cone Click to See the experiment Here the vertical height and radius of cylinder & cone are same. 3( volume of cone) = volume of cylinder V = 1/3 π r2h
if both cylinder and cone have same height and radius then volume of a cylinder is three times the volume of a cone ,
Mr. Mohan has only a little jar of juice he wants to distribute it to his three friends. This time he choose the cone shaped glass so that quantity of juice seem to appreciable.
Area of a circle having sector (circumference) 2π l = π l 2 Area of circle having circumference 1 = π l 2/ 2 π l So area of sector having sector 2 π r = (π l 2/ 2 π l )x 2 π r = π rl Surface area of cone
Comparison of Area and volume of different geometrical figures
Area and volume of different geometrical figures
Total surface Area and volume of different geometrical figures and nature So for a given total surface area the volume of sphere is maximum. Generally most of the fruits in the nature are spherical in nature because it enables them to occupy less space but contains big amount of eating material. 22r
Think : Which shape (cone or cylindrical) is better for collecting resin from the tree Click the next
r V= 1/3π r2(3r) V= π r3 Long but Light in weight Small niddle will require to stick it in the tree,so little harm in tree V= π r2 (3r) V= 3 π r3 Long but Heavy in weight Long niddle will require to stick it in the tree,so much harm in tree r
V=1/3 πr2h If h = r then V=1/3 πr3 r r If we make a cone having radius and height equal to the radius of sphere. Then a water filled cone can fill the sphere in 4 times. V1 = 4V = 4(1/3 πr3) = 4/3 πr3
4( 1/3πr2h ) = 4( 1/3πr3 ) = V h=r Volume of a Sphere Click to See the experiment Here the vertical height and radius of cone are same as radius of sphere. 4( volume of cone) = volume of Sphere V = 4/3 π r3
Volume is the amount of space occupied by any 3dimensional object. 1cm 1cm 1cm Volume = base area x height = 1cm2 x 1cm = 1cm2
Side 2 Bottom Back Top Side 1 Front Length (L) Breadth (B) Height (H) Cuboid
The net L L L L B H H H H L B B B B B H H
H B L H B H L L L H B L H B H L L Total surface Area = L x H + B x H + L x H + B x H + L x B + L x B = 2 LxB + 2BxH + 2LxH = 2 ( LB + BH + LH ) Total surface Area
Cube Volume = Base area x height = L x L x L = L3 L L L Total surface area = 2LxL + 2LxL + 2LxL = 6L2
2(LxB + BxH + LxH) LxBxH Cuboid 6L2 L3 Cube Sample net Total surface area Volume Figure Name
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