# <span lang="EN-US

Since the angle subtended at centre is 60°

And by the property, if two sides of a triangle are equal then their corresponding angles are also equal.

ORP = OPR

As the sum of all internal angles of a triangle is equal to 180°

ORP = OPR = 60°

Δ OPR is an equilateral triangle.  AT = 43.25 sq. cm

Area Of Sector (O-PQR), AS is given as:  AS = 52.33 sq.cm

Area of shaded region, AR = As – AT

AR = 52.33 – 43.25

AR = 9.08 sq.cm

Area of shaded region is 9.08 sq.cm

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