Question

in the given figure o is the centre if angle cob=70

Answer 1

Step-by-step explanation:

Answer:

∠ADC = 25°

Step-by-step explanation:

Given that, ∠COB = 130°

∴ ∠AOC = 180° - ∠COB = 180° - 130° = 50°

Now 2∠ADC = ∠AOC  [By the same arc AC, Angle formed at the centre is twice the angle formed on any point on the circumference.

∴ 2∠ADC = ∠AOC = 50°

∴ ∠ADC =

(\frac{50}{2})

° = 25°

Answer is 25 ✔️✔️✔️✔️

Answer 2

Answer:

From the figure we know that the radius is

OA=OC

We know that the base angles of an isosceles triangle are equal

∠OAC=∠OCA

It is given that ∠OCA=35 °

So we get

∠OAC=35 °

Therefore, ∠OAC=35 °