Question

find the areas of the following rings whose external and internal diameters are 15cm and 13cm

Answer 1

$\pi \times 7.5 \times 7.5 \\ = 171.61$
and

$\pi \times 6.5 \times 6.5 = 132.73$
these are the area of two respective rings

Answer 2

Answer:

Step-by-step explanation:

What everyone is missing is that u have to find the area of the ring. There cannot be two areas because u have one ring and the part u have to find the area of is the metal one. Now what they have given is the internal diameter through which we wear our ring. It is 13 cm diameter. And if u ADD the metal one into it, then it is 15 cm diameter. Now what u have to do is:

(Sorry i cant find pi sign so I'll write it as pi and r square is written as rsq)

Pi rsq - pi rsq

Insert values.

22/7 (7.5 sq - 6.5 sq)

22/7 (56.25 - 42.25)

22/7 (14)

22x2

= 44 cm sq

Therefore 44 is the area of ur ring which is the metal part. The space in between a ring isnt part of the ring.