If radius = 45 mm, then area = 6361.7 mm2 (to 1 dp).
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A circle with a radius of 50 mm has an area of 7853.98 square mm
The radius of a circle with an area of 35 mm squared is 3.34mm
Area in square mm = pi*radiuis2
The area of a circle whose diameter is 6 mm is: 28.27 mm2
Area in square mm = pi*1252