Question

if diameter of a cone is 12cm. and its height 8cm. then find total surface area of cone.​

Answer 1

Answer:

It's 2112/7 cm^2

Step-by-step explanation:

You can also convert it into decimal

Answer 2

ANSWER:

• T.S.A of the cone = 301.44 cm²

GIVEN:

• Diameter of the cone is 12cm.

• Height of the cone is 8cm.

TO FIND:

• T.S.A of the cone = 301.44 cm²

EXPLANATION:

$\boxed{ \large{\bold{ \gray{T.S.A \ of \ cone = \pi r(l + r)}}}}$

r = d/2 = 6 cm

$\boxed{ \large{\bold{ \gray{l = \sqrt{h^2+r^2}}}}}$

h = 8 cm

r = 6 cm

$l = \sqrt{8^2+6^2}$

$l = \sqrt{64+36}$

l = √100

l = 10 cm

T.S.A of the cone = π × 6(10 + 6)

T.S.A of the cone = 3.14 × 6 (16)

T.S.A of the cone = 3.14 × 96

T.S.A of the cone = 301.44 cm²

Hence the T.S.A of the cone = 301.44 cm².