Set up an equation in the following cases: In an isosceles traingle, the vertex angle is twice either base angel. (Let the base angle be b in degrees. Remember that the sum of angles of a traingle is 180 degrees.

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

Which of the following can be the sides of a right triangle: 2cm, 2cm, 5cm. In the case of right-angled traingles, identify the right angles.

Which of the following can be the sides of a right triangle: 2.5cm, 6.5cm, 6cm. In the case of right-angled traingles, identify the right angles.

Which of the following can be the sides of a right triangle: 1.5cm, 2cm, 2.5cm. In the case of right-angled traingles, identify the right angles.

From the pair of linear equations for the following problems and find their solution by substitution method. The larger of two supplementary angles exceeds the smaller by 18 degrees. Find them.

From the pair of linear equations for the following problems and find their solutions by substitution method. The largest of two supplementary angle exceeds the smaller by 18 degrees. Find them.

Which of the following sets are empty sets? Justify your answer. (i) A={x : x^(2)=4 and 3x=9} (ii) The set of all triangles in a plane having the sum of their three angles less than 180.

Complete the following chemical reaction equations : (i) P_(4)+SO_(2)Cl_(2)rarr (ii) XeF_(6)+H_(2)Orarr (b) Predict the shape and the asked angle (90^(@)" or more or less") in each of the following cases : (i) SO_(3)^(2-) and the angle O-S-O (ii) ClF_(3) and the angle F-Cl-F (iii) XeF_(2) and the angle F-Xe-F