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Review the equation of a circle and practice solving problems related to it.
We can use the constant of proportionality between the arc length and the radius of a sector as a way to describe an angle measure, because all sectors with the same angle measure are similar.
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Learn how to find the radius and diameter from the circumference of a circle on Khan Academy.
Showing that area is equal to inradius times semiperimeter. Well, if you're working on anything that's triangular shaped (maybe a table, maybe a patio, maybe a field, maybe even a city!) and you want to place something in the center so that is equally distanced and easy to access from all sides of the triangle - they do, or at least did, this a lot with churches and city halls - you're gonna ...
Learn about curvature and how to differentiate vector-valued functions on Khan Academy.
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Well, actually it's quite simple! When diameter is 2 cm Then, Radius = 1cm Therefore, A=(pi)r^2 =(pi)*r*r =3.14*1*1 =3.14 (approx.) But, if Radius < 1cm,