Question

∆ABC~∆PQR. A=30,B=100,C=50 then Q=____ a)30. b) 100. c)50. d)180​

Answer 1

Answer:

The six elements of a triangle are its three angles and the three

sides.

• The line segment joining a vertex of a triangle to the mid point of its

opposite side is called a median of the triangle. A triangle has

3 medians.

• The perpendicular line segment from a vertex of a triangle to its

opposite side is called an altitude of the triangle. A triangle has

3 altitudes.

• An exterior angle of a triangle is formed, when a side of a triangle is

produced.

• The measure of any exterior angle of a triangle is equal to the sum of

the measures of its two interior opposite angles.

• The sum of the three angles of a triangle is 180°.

• A triangle is said to be equilateral, if each of its sides has the same

length.

• In an equilateral triangle, each angle has measure 60°.

• A triangle is said to be isosceles if at least two of its sides are of same

length.

• The sum of the lengths of any two sides of a triangle is always greater

than the length of the third side.

• The difference of the lengths of any two sides of a triangle is always

smaller than the length of the third side.