Question

if the angles subtended by the chords of a circle at the centre are equal, then the chords are equal ?​

Answer 1

Answer:

folow me

Step-by-step explanation:

To Prove: AB=CD

Proof:- In △AOB & △DOC

OA=OD[radius],∠AOB=∠DOC(given)

OB=OC(radius)

∴△AOB≅△COD[SAS congr]

∴AB=CD [By cpct]

Hence proved.

Answer 2

Answer:

The earliest time that life forms first appeared on Earth is at least 3.77 billion years ago, possibly as early as 4.28 billion years, or even 4.41 billion years—not long after the oceans formed 4.5 billion years ago, and after the formation of the Earth 4.54 billion years ago.