Question9. ${ }^{7}$ (a) If the two angles of a triangle are $50^{\circ}$ and $75^{\circ}$, find the third ang. b) If $2 x^{\circ}, 4 x^{\circ}$ and $6 x^{\circ}$ are the three angles of a triangle, find the valuer is find the angles. (c) If the three angles of a triangle are $x^{\circ},(x+20)^{\circ}$ and $(x-50)^{\circ}$, find x . Also, find the angles. (d) If the two opposite interior angles of a triangle are $30^{\circ}$ and $55^{\circ}$ exterior angle of a triangle.
10. त(3) In a right angled triangle, one acute angle is $40^{\circ}$. Find the other atexes that triangle. (b) In an equilateral triangle, one angle is $60^{\circ}$. Find the remaining anglo (c) In an isosceles triangle, one base angle is $45^{\circ}$. Find the another bases
स'(d) If one angle of an isosceles triangle is equal to the sum of remaining angles, find the size of each angle.
11. (a) In a $\triangle A B C, \angle A=\angle B=65^{\circ}$, find $\angle C$.