Question

I need the answer to this please

Answer 1

Explanation:

Alright, lets get started.

When two secants intersects outside a circle then the measure of the angle formed is half of the positive difference of the measures of the intercepted arcs. (Please refer the diagram I have attached)

Hence the measure of ∠1 is :

∠1=
`(1)/(2)(100-30)`

∠1=
`(1)/(2)*70=35`

hence the answer is 35°. : Answer

Hope it will help :)