Maths Formulas For Class 8

Most of the students of class 8 feel Mathematics subject itself as a nightmare and maths formulas for class 8 even more difficult to grasp and remember. This negative attitude towards one of the important subjects in every walk of life makes them reluctant to study. Many get nervous just before exams and develops a feeling of obsession. To stay away from these kind of problems, Byju’s brings you maths formula list for class 8 for CBSE syllabus.

When you understand the logic behind every problem and formulas, solving any kind of maths problem becomes easier. If you are perfect with all the below mentioned formulas that are listed chapterwise, we assure you that nothing can stop you from obtaining maximum score in class 8 Mathematics examination.

 

Geometry Shapes Formulas for Class 8

Name of the Solid Lateral / Curved Surface Area Total Surface Area Volume
Cuboid 2h(l+b) \(2\left ( lb+bh+hl \right )\) \(lbh\)
Cube \(4a^{2}\) \(6a^{2}\) \(a^{3}\)
Right Prism \(Perimeter \; of \; base \times height\) \(Lateral \; Surface \; Area + 2(Area \; of \;  One \; End)\) \(Area \; of \; Base \times Height\)

Right Circular Cylinder \(2\pi rh\) \(2\pi r \left (r+h \right )\) \(\pi r^{2} h\)
Right Pyramid \(\frac{1}{2} Perimeter \; of \; Base \times \; Slant Height\) \(Lateral \; Surface \; Area + Area \; of \; the \; Base\) \(\frac{1}{3}(Area \; of \; the \; Base) \times height\)
Right Circular Cone \(\pi rl\) \(\pi r \left (l+r \right )\) \(\frac{1}{3}\pi r^{2}h\)
Sphere \(4\pi r^{2}\)

\(4\pi r^{2}\) \(\frac{4}{3}\pi r^{3}\)
Hemisphere \(2\pi r^{2}\)

\(3\pi r^{2}\)

\(\frac{2}{3}\pi r^{3}\)

 

Geometric Area Geometric Area Formula
Square \(a^{2}\)
Rectangle \(ab\)
Circle \(\pi r^{2}\)
Ellipse \(\pi r1\: r2\)
Triangle \(\frac{1}{2}bh\)

 

Algebraic Identities For Class 8

\((a+b)^{2}=a^2+2ab+b^{2}\)
\((a-b)^{2}=a^{2}-2ab+b^{2}\)
\(\left (a + b \right ) \left (a – b \right ) = a^{2} – b^{2}\)
\(\left (x + a \right )\left (x + b \right ) = x^{2} + \left (a + b \right )x + ab\)
\(\left (x + a \right )\left (x – b \right ) = x^{2} + \left (a – b \right )x – ab\)
\(\left (x – a \right )\left (x + b \right ) = x^{2} + \left (b – a \right )x – ab\)
\(\left (x – a \right )\left (x – b \right ) = x^{2} – \left (a + b \right )x + ab\)
\(\left (a + b \right )^{3} = a^{3} + b^{3} + 3ab\left (a + b \right )\)
\(\left (a – b \right )^{3} = a^{3} – b^{3} – 3ab\left (a – b \right )\)<

 


Practise This Question

What is the last step in constructing quadrilateral with 3 sides and 2 included angles given?