Question

Determine the surface area of ​​a ball that has a 15 cm radius

Answer 1

Ball surface area formula = 4.π.r²

Known: r (radius) = 15 cm

Asked: Ball surface area?  

Answer: L = 4.π.r² = 4.22 / 7. (15) ² = 4.22 / 7,225 = 2,828.6 Cm²

Discussion

• Ball is a plane formed from points which have the same distance to a point called the center point of the ball.
• The dimensions of a ball are expressed in terms of radius or diameter, which is the distance between the surface of the ball and the center of the ball. While the ball diameter is the distance of a straight line between a ball's surface and the surface opposite the center point through the center point of the ball. The diameter of the ball is twice the radius of the ball.
• Ball surface area is the area of ​​the plane that forms the surface of the ball The surface of the ball is also called a ball skin / ball blanket.
• To calculate the surface area of ​​a ball, you must know the size of the radius or dimension of the ball, using the formula:
• Ball surface area = 4.π.r²

Answer 2

Answer:

2821.5

Step-by-step explanation:

surface area of ball=4πr.r

=4×3.14×15×15

=12.56×225

=2821.5 cm2