The angles of a triangle are (2x + 10)^o, (x + 20)^o and (x - 10^o). Find the value of x

If two sides of d triangle are equal, then it is called _________

The point of intersection of the altitudes of a triangle is called _________

Corresponding to any side, the length of perependicular drawn from the opposite vertex to that side is ____________.

If all sides of a triangle are equal, then all its angles are

If one angle of a triangle is obtuse then that triangle is called ________

The ________ of a triangle corresponding to any side, is the line joining the mid point of that side with the opposite vertex. 

In ΔPQR,

oand o. Find all angles of a triangle

If one angle of a triangle is greater than the sum of the other two angles then the triangle is

from figure,