Question

if radius is 10cm and slant height is 3.5 of the cone, then it's total surface area is______​

Answer 1

Answer:

Total surface area of cone= πrl(l+r)

on putting the value of

r=10cm and

l=3.5cm

you get the answer.

Answer 2

✠ Given :-

• Radius of cone = 10 cm
• Slant height of cone = 3.5 cm

-----------------------------------------------------------------

✠ To Find :-

• Total surface area of the cone

-----------------------------------------------------------------

✠ Solution :-

$\large \red\bigstar \: \boxed{ \underline{ \bf\green{ T.S.A \: of \: cone = \pi r(r + l)}}}$

$\longmapsto \sf T.S.A = \frac{22}{7} \times 10(10 + 3.5)$

$\longmapsto \sf T.S.A = \frac{22}{7} \times 10 \times 13.5$

$\longmapsto \sf T.S.A = \frac{2970}{7}$

$\longmapsto \sf T.S.A = 424.28 \: {cm}^{2}$