If the Sun were to contract and become a black hole, what would be its approximate radius? The speed of light

If the Sun were to contract and become
a black hole, what would be its approximate radius? The speed of light is
2.997 × 10
8 m/s, the gravitational constant
is 6.672 × 10
−11 m3
/(kg · s
2
), and the mass of
the Sun is 1.991 × 10
30
kg .
Answer in units of km

R = 2 * G * M / C²

2.952432 kilometers

Speed of light doesn't change, it just wouldn't be able to escape from the black hole.

A solar-mass black hole would have an event horizon radius of 2.95 km.