53.41 cm
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radius = 17/(2*pi) = 2.705634033 or 2.706 cm to 3 d.p.
1m 17cm > 109cm--1m 17cm = 117cm117cm > 109cm
They are a measurement of distance
If the sides are 10cm, 17cm and 21cm, the three angles are approx 28, 53 and 99 degrees. It is an obtuse angled triangle.
60 cm2