Question

PLEASE HELP ME. please please please

Answer 1

`\Large\underline{\rm Solution :- }`

Theorem : Angle subtended at the centre is double the the angle subtended at the circumference of the circle .

Here
`\overline{AOC}` is a straight line. So it's measure is 180°. Therefore the angle subtended at the circumference will be ,

`\implies \angle ABC = (1)/(2)* 180° \\\\\implies \boxed{ \angle ABC = 90° }`

Remember: Angle in a semicircle is 90°.