Question

4. Find the total surface area of a right circular cone
with radius 6 cm and height 8 cm.​

Answer 1

Answer:

l=√h^2+r^2

l=√64+36

l=√100

l=10

tsa = πr(l+r)

= 22/7*6(10+6)

= 22/7*6*16

= 301.71cm^2

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Answer 2

Answer:

GIVEN:

Radius of a right circular cone = 6 cm

height of right circular cone = 8 cm

$we \: know \: that \: total \: surface \: area \: of \\ \\ right \: circular \: cone \: = \pi \: rl \: + \pi \: r {}^{2} \\ \\ where \: l = \sqrt{h {}^{2} + r {}^{2} } \\ \\ \\ here... \: l = \sqrt{6 {}^{2} + 8 {}^{2} } \\ \\ l = \sqrt{100} \\ \\ l = 10 \: cm \\ \\ tsa \: = \: \pi \: r(l + r) \\ \\ = \frac{22}{7} \times 6 \times (10 + 6) \\ \\ = \frac{22}{7} \times 6 \times 16 \\ \\ = \frac{2112}{7} \\ \\ = 301.71 \: cm {}^{2}$

the total surface area of a right circular cone = 301.71 cm^2