Question

only Q .no. 17 please help me ​

Answer 1

Let ABC is a triangle in which ang. A = ang.B = ang.C

Now to proof:- all the angles of the triangle will be 60°

According to the angel sum property of traingle,

ang.A+ ang.B + ang.C =180°

3×ang.A = 180°. {all the angles are equal}

so, ang.A =180÷3=60°

Now, as all the angles are equal therefore

ang.A = ang.B = ang.C = 60°

Answer 2

Let the angles of triangle be x

By angles some property of triangle

x + x + x = 180

3x = 180x

= 180 / 3

x = 60

Hence Proved