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May I know the method being used to get the radius of the sector in the diagram??

Screenshot_2020-06-26-11-07-17-1.png
4. Rajah di bawah menunjukkan sektor bagi
satu bulatan berpusat O.
The diagram shows a sector of a circle with
centre O.
Perimeter bahagian yang berlorek ialah
43 cm. Cari panjang, dalam cm, jejari bulatan
itu.
The perimeter of the shaded part is 43 cm.
Find the length, in cm, of the radius of the
circle.
Guna/Use n = 22
A 7
B 14
C 21
D 50
Subject: Math

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