Circles Review – Fundamentals of Circles, Formulas for Circle, Congruent Circles, Tangent to a circle, Polygon inscribed in a Circle , Circle inscribed in a circle, Concentric Circles
Class Questions – Exercise 1 Exercise 2 Exercise 3 Exercise 4 Exercise 5
Practice Questions – Solutions
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1. Congruent Circles
If the radius of two circles is same then they are identified as congruent Circles.
2.Tangent to a circle
Tangent line is the line which intersects the circle at one point only and that point is known as point of Tangency.
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Radius of the circle and tangent line intersect at 90°.
3. Polygon inscribed in a Circle or Circle Circumscribed a polygon
When all the vertices of a polygon lie on the circumference of the circle, it is known as inscribed polygon or circle is circumscribed about a polygon.
When one side of the inscribed triangle is diameter of the circle then triangle will be a right angle triangle. As in the following figure ΔPQR is a right angle triangle.
4. Circle inscribed in a circle or Polygon Circumscribed a circle
If each side of the Polygon is tangent to a circle, then it is known as circle is inscribed in a polygon or polygon is circumscribed about a circle
5. Concentric Circles
When two or more circles are having same centers then it is known as concentric circles.
