CLASS-9 MENSURATION

VOLUME OF A SPHERE =

• $\frac{2}{3}\pi r^3$

• $4\pi r^2$

• $\frac{1}{3}\pi r^2h$

• $\frac{4}{3}\pi r^3$

LATERAL SURFACE AREA OF RIGHT PYRAMID =

• $\frac{1}{3}\left(area\ of\ base\ \times\ height\right)$

• $\left[\frac{1}{2}\times Perimeter\ of\ base\ \times\ Slant\ height\right]$  
  

• $\frac{4}{3}\pi r^3$
  

• None of these

In a right circular cone of radius 'r' and height 'h' its slant height 'l' =

• $\frac{1}{3}\pi r^2h$

• $r^2+h^2$

• $\sqrt{h^2+r^2}$

• both 2 & 3

Total surface area of a cube of whose side length is 'l' =

• $a^3$

• $4\pi r^2$

• $4a^2$

• $6l^2$

Total Surface Area of cone =

• $\frac{1}{3}\pi r^2h$

• $\pi rl$

• $\pi rl\ +\ \pi r^2$

• none of these

Volume of a right pyramid =

• Area of base X Height

• $\frac{1}{3}\ \times\ \left(Area\ of\ Base\ \times\ Height\right)$

• L.S.A + Area of the Base

• Perimeter of base x Height

T.S.A of a Cylinder =

• $2\pi rh$

• $2\pi rh\ +\ 2\pi r^2$

• $\pi rl$

• none of these

Total Surface Area of a cuboid=

• (Perimeter of base x Height) + 2 lb

• 2(lh + bh)

• 2(lb+bh+lh)

• Both 1 & 3

Total surface area of hemisphere=

• $2\pi r^2$

• $3\pi r^2$

• L.S.A of sphere - ( Area of circle)

• Both 2 & 3

Volume of Hemisphere=

• $\frac{4}{3}\pi r^3$

• $2\pi r^2$

• $\frac{2}{3}\pi r^3$

• none of these