Hi student, let me help you out! :)
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We are asked to find the area of the circle.
Where:
A=Area
π=pi
r=radius (12 mm)
Have you noticed the next to r? This tells us to multiply the radius times itself.
So, we substitute the values:
Square 12 first, then multiply:
Upon simplifying,
Hope it helps you out! :D
Ask in comments if any queries arise.
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~Just a smiley person helping fellow students :)