17) The diameter of a circular placemat is 30cm. Find the circumference to the nearest millimetre.
the answer is 943mm but how please tell and solve it
plz.plz.plz.plz.plz...
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Answer:
The circumference to the nearest millimetre is "942 millimeter".
Step-by-step explanation:
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The diameter of a circular placemat is 30cm = 300 mm
.°. Radius (r) of the circular placemat is = 300/2 = 150 mm
We know that,
circumference of circle = 2πr
.°. the circumference of the circle = 2πr
= 2 × 22/7 × 150
= 6600/7 cm
= 943 mm (approximately)
.°. the circumference of the circle is 943 mm (approximately)
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