Question

The shaded region ABCD shows the space enclosed by two concentric
circles with centre ‘Oʻ and the angle at the centre is 75°. If the radii of
the circles are 21 cm and 42 cm, find the area of the shaded region and
the perimeter of ABCD.
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Answer 1

Answer:

give figure of this question . then it becomes easy to explain ☺️☺️

Answer 2

Answer:

Step-by-step explanation: you can find the shaded region by finding the ar of the sector of the 1st circle & next finding the ar of the 2nd circle

Since the 42 cm is the bigger one minus the second circle from the first circle for the shaded region

Well if there was an attachment of the pic it would be more easier