Question

if r = 7 cm, find the area of sphere ?​

Answer 1

✦ Correct Question :

• if r = 7 cm, find the area of sphere ?

✦ Required Solution:

✦ Formula used here :

• Area = 4πr²

✦ Value given to us :

• Radius (r) = 7cm

∆ Now putting in formula :

• Area = 4 × 3.14 × (7)² cm

• Area = 4 × 3.14 × 49 cm

✰ Area of sphere = 615 .75 cm² ✰

____________________________

Answer 2

Answer:

$\large \underline\red {\sf \pmb{Given}}$

• ➢ Radius of Sphere = 7 cm

$\large \underline\red{\sf \pmb{To \: Find }}$

• ➢ Area of Sphere

$\large \underline\red {\sf \pmb{Using \: Formula}}$

$\circ\underline{\boxed {\sf{Area \: of \: Sphere =4 {\pi} {r}^{2} }}}$

$\large \underline {\sf \pmb{Solution}}$

$: \implies{\sf{Area \: of \: Sphere =4 {\pi} {r}^{2} }}$

• ➣ Substituting the values

$: \implies{\sf{Area \: of \: Sphere =4 \times { \dfrac{22}{7} } \times {7}^{2} }}$

${: \implies{\sf{Area \: of \: Sphere =4 \times { \dfrac{22}{7} } \times7 \times 7 }}}$

${: \implies{\sf{Area \: of \: Sphere =4 \times { \dfrac{22}{ \cancel{7} }}\times \cancel{7 }\times 7 }}}$

${: \implies{\sf{Area \: of \: Sphere =4 \times22 \times{7}}}}$

${: \implies{\sf{Area \: of \: Sphere =616 \: {cm}^{2} }}}$

$\underline{ \boxed{ \boxed{\sf \purple{Area \: of \: Sphere =616 \: {cm}^{2} }}}}$

• ➢ Henceforth,The Area of Sphere is 616 cm²

$\large \underline\red{\sf \pmb{Diagram}}$

$\setlength{\unitlength}{1.2cm}\begin{picture}(0,0)\thicklines\qbezier(2.3,0)(2.121,2.121)(0,2.3)\qbezier(-2.3,0)(-2.121,2.121)(0,2.3)\qbezier(-2.3,0)(-2.121,-2.121)(0,-2.3)\qbezier(2.3,0)(2.121,-2.121)(-0,-2.3)\qbezier(-2.3,0)(0,-1)(2.3,0)\qbezier(-2.3,0)(0,1)(2.3,0)\thinlines\qbezier (0,0)(0,0)(0.2,0.3)\qbezier (0.3,0.4)(0.3,0.4)(0.5,0.7)\qbezier (0.6,0.8)(0.6,0.8)(0.8,1.1)\qbezier (0.9,1.2)(0.9,1.2)(1.1,1.5)\qbezier (1.2,1.6)(1.2,1.6)(1.38,1.9)\put(0.2,1){\bf 7cm}\end{picture}$

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$\large \underline\red{\sf \pmb{Know \: More }}$

Sphere

• ➤ A sphere is shaped like a ball. It can be hollow or solid.
• ➤ A sphere is a round, ball-shaped solid. It has one continuous surface with no edges or vertices.

Formula Related To Sphere

★ Diameter of a Sphere Formula

• $: \implies \sf \purple{D = 2 r}$

★ Surface Area of a Sphere Formula

• $: \implies \sf \purple{A = 4 \pi {r}^{2} }$

★ Volume of a Sphere

• $: \implies \sf \purple{V = \bigg( \dfrac{4}{3} \bigg) π {r}^{3} }$