Question

DJ2
25. The radius of a sphere is measured as (2.1 +0.5) cm. Its surface area with error limits is
a) (55.4 25.4) cm
b) (52.4 22.4) cm?
c)(55.4 26.4) cm?
c) (52.4 25.4) cm
MOOTO
Indust​

Answer 1

Answer:

c) 55.4 ± 26.4cm²

Explanation:

Sphere is a perfect round geometrical object in three-dimensional space that is the surface of a completely round ball.

Radius of sphere S = (2.1 +0.5) cm (Given)

Surface area of sphere = S = 4πr²

Therefore,

= 4π (2.1)²

= 55.4cm²

= ΔS/S = 2Δr/r→ ΔS = 2Δr/rS

= ΔS = 2×0.5×55.4/2.1

=26.4cm²

= S =55.4 ± 26.4cm²

Therefore, the  surface area with error limits is 55.4 ± 26.4cm²