Question

please I want answer to this problem​

Answer 1

$\underbrace{ \underline{ ANSWER}}$

4.) find the surface area of a sphere radius 3.5cm.

$✠ \: \: FORMULA \: \: USED::-$

$surface area of sphere = \pink{A= 4πr^2}$

$✠ \: LET'S \: DO \: IT::-$

$A = 4 \times \frac{22}{7} \times {3.5}^{2}$

$: \longrightarrow\: A = \red{154 {cm}^{2} }$

5.) if CSA of cone is 308 cm^2 and slant height is 14 cm, find radius of base.

$✠ \: FORMULA \: \: USED:::-$

$CSA = \purple{\pi \: rl}$

$✠ \: LET'S \: \: DO \: \: IT:::-$

$308 = \frac{22}{7} \times r \times 14$

$r = \: \frac{308 \times 7}{22 \times 14}$

$: \longrightarrow \: r = \blue{ 7cm}$

6.) find volume of cylinder if base perimeter is 154cm and height is 28cm.

✠FORMULA USED:::-

✔️Volume of cylinder = (22/7 ×r^2 ×h)cm^2

✔️ perimeter of cylinder = l+b+h

✠ LET'S DO IT:::-

let l and b of cylinder be x.

perimeter of cylinder = l+b+h

154 = x^2+28

x^2 =154-28

x^2 = 126

∴ x^2 = 11.5cm

BE BRÃÎÑLY❥

✝HOPE IT HELPS ✝

Answer 2

4.) find the surface area of a sphere radius 3.5cm.

FORMULA USED::−

surface area of sphere = A= 4πr^2

A = 4 {22/7} {3.5}^{2}

A=4× 22/7 ×3.5^2

A = {154 {cm}^{2} }

.:⟶A=154cm^2

5.) if CSA of cone is 308 cm^2 and slant height is 14 cm, find radius of base.

FORMULA USED:::−

CSA = CSA=πrl

308 = {22/7} *r * 14

r = (7*308)/ (22*14)

r = 7

.:⟶r=7cm

6.) find volume of cylinder if base perimeter is 154cm and height is 28cm.

✠FORMULA USED:::-

✔️Volume of cylinder = (22/7 ×r^2 ×h)cm^2

✔️ perimeter of cylinder = l+b+h

✠ LET'S DO IT:::-

let l and b of cylinder be x.

perimeter of cylinder = l+b+h

154 = x^2+28

x^2 =154-28

x^2 = 126

∴ x^2 = 11.5cm

Hlo Stanley...

how are you?