Question

What is the TSA of cone having radius 12 cm and slant height 21 cm?​

Answer 1

${\bf{\blue{Hola!!}}}$

Given:-

Slant height (l)=21 cm

Radius (r)=12 cm

To find:-
TSA

TSA=πr(r+l)

=22/7×12(12+21)

=22/7×12(33)

=11/7×6(33)

=11/7×198

=11×198/7

=2178/7

${\bf{\purple{TSA=311.1\:cm^2}}}$


$<marquee>$#Bebrainly❤️✔️✨❤️✔️✨

Answer 2

hey..

$tsa = \pi \: r(l + r) \\ \\ \: \: \: = 3.4 \times 12(21 + 12) \\ \\ = 3.14 \times 12 \times 33 \\ \\ = 1243.44 {cm}^{2}$