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

Express the following statements by equations : The sum of the degree measures of the three angles of a triangle is 180^@ . The measure of the 2nd angle is twice that of the 1st and exceeds the thrid angle by 40^@ .

State whether the following statement is true or false: The sum of the interior angles of a triangle is 180^@ .

Solve the following: In an isosceles triangle, the base angles are equal. The vertex angle is 40^@ . What are the base angles of the triangle? (Remember, the sum of three angles of a triangle is 180^@ ).

In an isosceles triangle, the base angles are equal.The vertex angle is 40^@ .What are the base angles of the triangles? (Remember the sum of three angles of a triangle is 180^@ )

Sum of the three angles of a triangle ABC is 180^@ . The ratio fo BAC, angleABC and angleACB is 3:5:10 . If the value of angleBAC is decreased by 10^@ and values of angleABC is increased by 10^@ . Let's calculate the new ratio of the three angles.

Which of the following statements are true (T) and which are false (F): Sum of the three angles of a triangle is 180^0 A triangle can have two right angles. All the angles of a triangle can be less than 60^0 All the angles of a triangle can be greater than 60^0 All the angles of a triangle can be equal to 60^0 A triangle can have two obtuse angles. A triangle can have at most one obtuse angles. In one angle of a triangle is obtuse, then it cannot be a right angled triangle. An exterior angle of a triangle is less than either of its interior opposite angles. An exterior angle of a triangle is equal to the sum of the two interior opposite angles. An exterior angle of a triangle is greater than the opposite interior angles

Which of the following statements are true (T) and which are false (F): Sum of the three angles of a triangle is 180^0 A triangle can have two right angles. All the angles of a triangle can be less than 60^0 All the angles of a triangle can be greater than 60^0 All the angles of a triangle can be equal to 60^0 A triangle can have two obtuse angles. A triangle can have at most one obtuse angles. In one angle of a triangle is obtuse, then it cannot be a right angled triangle. An exterior angle of a triangle is less than either of its interior opposite angles. An exterior angle of a triangle is equal to the sum of the two interior opposite angles. An exterior angle of a triangle is greater than the opposite interior angles

We know that the sum of the interior angles of a triangle is 180^0 . Show that the sums of the interior angles of polygons with 3,4,5,6 sides form an arithmetic progression. Find the sum of the interior angles of a 21 sided polygon.