Question

16.surface area and volume What are the formula​

Answer 1

Answer:

formula of???

• cube - 6a^2
• cuboid - (lb×bh×lh)

Answer 2

Answer:

For cube,

side = a

Total surface area =

$6 {a}^{2}$

Lateral surface area =

$4 {a}^{2}$

Volume =

${a}^{3}$

Cuboid

Length = l

breadth = b

height = h

Total surface area = 2(lb+bh+hl)

Lateral surface area = 2h(l+b)

Volume = lbh

Cylinder

r = Radius

h = Height

Curved surface area =

$2\pi \: r \: h$

Total surface area =

$2\pi r(r + h)$

Volume =

$\pi \: {r}^{2} h$

Cone

l = slant height

h= height

r = radius

Volume =

$\frac{1}{3} \pi {r}^{2} h$

Curved surface area,

$\pi \: r \: l$

Total surface area =

$2\pi </u></em></strong><strong><em><u>r</u></em></strong><strong><em><u> (r + l)$

Sphere and hemisphere,

r = radius

For sphere ,

Volume

$\frac{4}{3} \pi \: {r}^{3}$

Curved surface area

$3\pi {r}^{2}$

Total surface area

$4\pi {r}^{2}$

For hemisphere,

Volume =

$\frac{2}{3} \pi \: {r}^{3}$

Curved surface area =

$2\pi \: {r}^{</u></em></strong><strong><em><u>2</u></em></strong><strong><em><u>}$

Total surface area =

$3\pi {r}^{</u></em></strong><strong><em><u>2</u></em></strong><strong><em><u>}$