Question

find the CSA and TSA of a cone of base radius 8cm and height 15cm

Answer 1

$l \: = \sqrt{225 + 64 } = 17$
$csa \: = \pi \times 8 \times 17 = 427.04$
$tsa = \: \frac{1}{3} \pi \times 64 \times 64 \times 15 = 64307.2$

Answer 2

Answer:

C.S.A of cone is 427.04 sq.m. and T.S.A of cone is 628 sq.m.

Step-by-step explanation:

Radius = 8 cm

Height = 15 cm

Curved surface area of cone = πr√(h^2+r^2)

                                                =3.14 * 8*√(15^2+8^2)

                                                =427.04 sq.m.

Total surface area of cone =πr[r+√(h^2+r^2)]

                                            =3.14*8*[8+√(15^2+8^2)]

                                            =628 sq.m.

Hence C.S.A of cone is 427.04 sq.m. and T.S.A of cone is 628 sq.m.