Question

answer this questions please 3 questions please

Answer 1

Given, C.S.A of Cone = 308 cm^2
& Slant Height (l) = 14 cm

i) As we know that,
=> C.S.A of Cone = 308 cm^2

$= > \: \pi \times r \times l \: = 308 \: {cm}^{2}$
putting the values,

$= > \frac{22}{7} \times r \times 14 = 308 \: {cm}^{2}$

$= > 44 \times r \: = 308$

$= > \: r \: = \frac{308}{44}$
$= > \: r \: = 7 \: cm \:$

Now,

ii). We know that,

=> T.S.A of Cone = C.S.A + Area of base ring

$= > t.s.a \: = 308 + \pi \times {r}^{2}$
$= > \: t.s.a = 308 + \frac{22}{7} \times 7 \times 7$
$= > t.s.a \: = 308 + 154 \: {cm}^{2}$
=> T.S.A of Cone = 462 cm^2


Be Brainly

Answer 2

(3) since, Curved surface area of a cone = 308 cm²

and, height of its slant (L) = 14 cm

(i) Let "r" be the radius .

$\therefore$ C.S.A = π × r × L

=> 308 = π × r × 14

let's take 14 to other side, as it's multiplying here, so after taking to other side it will divide!

=> $\frac{308}{14}$ = π × r

=> 22 = $\frac{22}{7}$ × r

=> r = $\cancel{22}$ × $\frac{7}{\cancel{22}}$

=> r = 7 cm

thus, radius of the base = 7cm.

(ii) Total surface area of cone,

= CSA + area of base

= 308 + π × r²

= 308 + $\frac{22}{\cancel{7}}$ × $\cancel{7}$ × 7

= 308 + 154

= 462 cm² (ANSWER)

Answer 3

(3) since, Curved surface area of a cone = 308 cm²

and, height of its slant (L) = 14 cm

(i) Let "r" be the radius .

$\therefore$ C.S.A = π × r × L

=> 308 = π × r × 14

let's take 14 to other side, as it's multiplying here, so after taking to other side it will divide!

=> $\frac{308}{14}$ = π × r

=> 22 = $\frac{22}{7}$ × r

=> r = $\cancel{22}$ × $\frac{7}{\cancel{22}}$

=> r = 7 cm

thus, radius of the base = 7cm.

(ii) Total surface area of cone,

= CSA + area of base

= 308 + π × r²

= 308 + $\frac{22}{\cancel{7}}$ × $\cancel{7}$ × 7

= 308 + 154

= 462 cm² (ANSWER)