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Step-4

Title: Area of 3D shapes

Grade: 8-a Lesson: S1-L6

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Step	Type	Explanation	Answer
1	Problem	Calculate the curved surface area of a sphere having a radius of 2 cm. Use pi = 3.14
2	Step	Given that the radius (r) of the sphere is	2 cm
3	Step	π (pi) is a constant approximately equal to 3.14.
4	Formula:	Curved Surface Area(A)	\$A = 4 \times\ π \r^2\$
5	Step	Substitute the values	\$A = 4 \times\ 3.14 \(2)^2\$ \$A = 4 \times 3.14 \times 4\$ = \$50.24\$
6	Step	So, the curved surface area of the sphere with a radius of 2 cm (using pi ≈ 3.14) is	\$50.24\$ sq.units
7		Answer	C

Step

Type

Explanation

Answer

Problem

Calculate the curved surface area of a sphere having a radius of 2 cm. Use pi = 3.14

Step

Given that the radius (r) of the sphere is

2 cm

Step

π (pi) is a constant approximately equal to 3.14.

Formula:

Curved Surface Area(A)

\$A = 4 \times\ π \r^2\$

Step

Substitute the values

\$A = 4 \times\ 3.14 \(2)^2\$

\$A = 4 \times 3.14 \times 4\$ = \$50.24\$

Step

So, the curved surface area of the sphere with a radius of 2 cm (using pi ≈ 3.14) is

\$50.24\$ sq.units

Answer