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**What is triangle?**

**Sides and Angles of triangle**

**Types of triangle on the basis of Side**

**Types of triangle on the basis of angles**

**The sum of the three angles of a triangle is `180^@`**

**If two parallel lines intersected by a transversal; prove that the bisectors of the two pairs of interior angle encloses a rectangle.**

**The sum of two angles of a triangle is equal to its third angle. Determine the measure of third angle.**

**In a `Delta ABC`; if `2 /_A = 3 /_B = 6 /_C`; Determine `/_A;/_B and /_C`**

**A triangle ABC is right angled at A. AL is drawn perpendicular to BC. Prove that ` /_BAL = /_ACB`**

**In `Delta ABC;/_B = 45^@;/_C=55^@` and bisector of `/_A` meets BC at a point D. find `/_ADB and /_ADC`**