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radius of semi circle = 21cm

area of semi circle = pi*r^2/2

=>22/7*21*21/2

=>11*3*21=693

A-B=357

x+B=693

A+x=1050

A+x=area of triangle

area of triangle = 1/2*base*height

=>1050=1/2*base*height

=>1050/21=base

QR=50

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Area of semi circle = 1/2 * 22/7 * 21^2 = 693 cm^2

Ar of PQR = 693 + (a-b) = 693 + 357

= 1050cm^2

And Ar of PQR = 1/2.b.h = 1050

therefore, 1/2 * b * 42 = 1050

b = 1050/21

hence base (QR) = 50cm

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