Determine the angle at the centre of a circle with radius 12.0 cm for an arc length of of 21.0 cm.
1 answer:
Answer:

Step-by-step explanation:
We have,
Radius of the circle is 12 cm
Arc length, l = 21 cm
It is required to find the central angle of the circle. The formula for the length of an arc of a circle is :

is central angle

So, the angle at the centre of the circle is
.
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