It is known that the radius of circle O is 1 and the chord is 0 CA.CB If the length of root sign is 2 and root sign is 3, then the angle ACB = how many degrees? Thank you It is known that the radius of the circle O is OC = 1 and the chord ca. If the length of CB is root 2 and root 3 respectively, how many degrees is the angle ACB?

It is known that the radius of circle O is 1 and the chord is 0 CA.CB If the length of root sign is 2 and root sign is 3, then the angle ACB = how many degrees? Thank you It is known that the radius of the circle O is OC = 1 and the chord ca. If the length of CB is root 2 and root 3 respectively, how many degrees is the angle ACB?

Connect OC, and make od perpendicular to AC at point D, OE perpendicular to BC at point E. because od perpendicular to D, OE perpendicular to e, so CD = 1 / 2Ac = 2 / 2 root sign 2, CE = 1 / 2BC = 2 / 2 root sign 3. Because OC = 1, so cos angle DCO = 2 root sign 2 divided by 1 angle DCO = 45 degrees cos angle eco = 2 root sign 3 divided by 1 angle eco = 30 degrees, so angle ACB =

The radius of fixed circle O is 4cm and that of moving circle P is 1cm
1: Let circle O and circle p be circumscribed. What is the distance between P and point o? What kind of line can point P move?
2: Let the circle o be inscribed with the circle P?

The distance between point P and point o = the sum of the radii of two circles
Point P can move on a circle with o as the center and the radius of the sum of the radii of circle O and circle P as the radius
The distance between point P and point o = the difference between the radii of two circles
Point P can move on a circle with o as the center and the radius difference between circle O and circle P as the radius