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Solid Shapes Definition Solids, or three-dimensional forms, are shapes that exist in space. Solid shapes are three-dimensional figures with length, breadth, and height. A ball is a spherical, or three-dimensional structure, whereas a circle drawn on paper is a two-dimensional object. Solid shapes, such as tables, seats, notepads, and pencils, are also everywhere. Here are some solid form instances and characteristics. Click to know about Solid - Properties and Types  Solid Formula List (Formula list for Solid Shapes in Maths) Now that we know about the properties of all these solids, let’s also make a note of all its perimeters and areas. Shape (solid shapes name) Volume Total Surface Area Cuboid l × b × h 2 (lb + lh + hb) Cube a 3 6a 2 Sphere (4/3)πr 3 4πr 2 Cylinder πr 2 h 2πr(r + h) Cone (⅓)πr 2 h πr(r + l) Solving some problems with these formulas 1. Calculate the surface area and volume of a cube where a side is 6 cm. Given that side, a = 8 cm Cube’s volume = a 3 Substituting the

CBSE Class 8 Maths – Linear Equation Examples Ques 1: Solve:4x+9=10 Solution: 4x+9=10 Transpose 9 from L.H.S to R.H.S 4x=10-9 ⇒4x=1 ⇒x=1/4 Ques 2: The perimeter of a rectangular swimming pool is 160 m. Its length is 5 m more than twice its breadth. Find the dimensions of the pool. Solution: Let the breadth of the swimming pool be m As the length of the swimming pool is 5 m more than twice its breadth, Length of the swimming pool 2x+5 Area of the swimming pool = 2(Length+ Breadth) =2(2x+5+x) =2(3x+5) =6x+10 Also, The perimeter of a rectangular swimming pool 160 m So, 6x+10=160 ⇒6x=160-10=150 ⇒6x=150 ⇒x=150/6=25 So, The breadth of the swimming pool=25 m Length of the swimming pool=2(25)+5=55 m Click to know more about Linear Equations for class 8 Maths Visit  Takshila   Learning, for  Online Tuition Classes  for  Class 8 Maths  and other subjects.