Explanation: In order to find the area of the circumscribed circle, we need to find its radius. There is a formula to do this, although it is a little troublesome. The formula for the circumradius is: …

If a,b and c are the lengths of the sides and S is the area of the triangle the radius of the inscribed circle is given by the formula: r= (2S)/ (a+b+c) The area S ...

Mar 29, 2018 · The area of a circle of radius r is given by the well known formula: A = πr2 If the diameter is d the we have d = 2r ⇒ r = d 2, thus we have: A = π(d 2)2 = πd2 4 Thus, we have: …

`````````````````````````````````````````````````````````````````````````````````````````````````````````````````` Alternative way We know, for an equilateral triangle radius of incircle (r) is half of the radius of the …

Feb 11, 2017 · The formula for the area of a circle is : A = πr2, where r is the radius of the circle. Given A = 49π, ⇒ 49π = πr2 ⇒ r = 7 Hence, the radius of the circle is 7km

There are two concentric circles at the center of a basketball court. The radius of the inner circle is 2 feet and the radius of the outer circle is 6 feet. What is the ratio of the circumference of the …

By the formula #A=rs#, where #A# is the area of the triangle, #r# is the radius of the inscribed circle, and #s# is the semi-perimeter of the triangle, if we know the area and the semi …

Explanation: Remember the formula for the circumference (#color (blue)C#) of a circle with radius #color (red)r# is #color (white) ("XXX")color (blue)C=2picolor (red)r# by re-arranging we get …

#"the centre is given and the distance from the centre to a "# #"point on the circumference is the radius"# #"to calculate r use the "color (blue)"distance formula"# #color (red) (bar (ul (|color …

See a solution process below: The formula for the circumference of a circle is: C = 2pir Where: C is the circumference of the circle r is the radius of the circle However, we also know; 2r = d …