**Master Mind**

*-Answered by Master Mind* On 19 February 2020:04:27:15 PM

**Question 1.** **Asked on :**19 February 2020:11:24:57 AM

If a,b and c are the sides of a right angled triangle where c is the hypotenuse ,then prove that the radius r or the circle which touches the sides of the triangle is given by

r = a + b - c2

*-Added by Master Mind* **Mathematics** » **Circle**

**Answer:**

*-Answered by Master Mind* On 19 February 2020:04:27:15 PM

**Question 2.** **Asked on :**30 January 2019:02:19:19 PM

Why is the area of circle is πr^{2}?

*-Added by Himanshi Verma* **Mathematics** » **Circle**

**Answer:**

The usual definition of pi is the ratio of the circumference of a **circle** to its diameter, so that the circumference of a **circle** is pi times the diameter, or 2 pi times the radius. ... This give a geometric justification that the **area** of a **circle** really is "pi r squared".

*-Answered by Himanshi Verma* On 02 February 2019:01:33:01 PM

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