maths formula for 8th class all chapter formula
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Answers
Right Pyramid LSA: ½ × p × l TSA: LSA + Area of the base Volume: ⅓ × Area of the base × h p = perimeter of the base, l = slant height, h = height
Right Circular Cylinder LSA: 2(π × r × h) TSA: 2πr (r + h) Volume: π × r2 × h r = radius, h = height
Answer:
Geometry Formulas for Class 8
To recall, geometric shapes are of two types which are 2D shapes and 3D shapes (or solid shapes). The list for all the 2D and 3D geometric shapes are:
Geometry Shapes Formulas for Solid Shapes:
Name of the Solid Lateral / Curved Surface Area Total Surface Area Volume
Cuboid 2h (l + b) 2 (lb + bh + hl) l × b × h
Cube 4a2 6a2 a3
Right Prism Perimeter of Base × Height Lateral Surface Area + 2(Area of One End) Area of Base × Height
Right Circular Cylinder 2 (π × r × h) 2πr (r + h) πr2h
Right Pyramid ½ (Perimeter of Base × Slant Height) Lateral Surface Area + Area of the Base ⅓ (Area of the Base) × Height
Right Circular Cone πrl πr (l + r) ⅓ (πr2h)
Sphere 4πr2 4πr2 4/3 (πr3)
Hemisphere 2πr2 3πr2 ⅔ (πr3)
Geometry Shapes Formulas for 2D Shapes:
Geometric Area Geometric Area Formula
Square a2
Rectangle a × b
Circle πr2
Ellipse πr1r2
Triangle ½(b × h)
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Algebra Formulas for Class 8
Some important 8th class formulas related to Algebra are:
Algebraic Identities For Class 8
(a + b)2 = a2 + 2ab + b2
(a − b)2 = a2 − 2ab + b2
(a + b) (a – b) = a2 – b2
(x + a) (x + b) = x2 + (a + b)x + ab
(x + a) (x – b) = x2 + (a – b)x – ab
(x – a) (x + b) = x2 + (b – a)x – ab
(x – a) (x – b) = x2 – (a + b)x + ab
(a + b)3 = a3 + b3 + 3ab (a + b)
(a – b)3 = a3 – b3 – 3ab (a – b)
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These are some of the important 8th class formulas in Maths which are crucial for solving problems and for the exams. Check out the below-given links, which are a few important Maths resources for class 8 Maths.