A line segment $A B$ is perpendicular to a line segment $C D$ at their point of intersection $O$ , write measures of $∠ A O C$

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Solution

$A B$ is given to be perpendicular to $C D$ . It makes an angle of $90 ˚$ at point O.
Thus, $∠ A O C = 90 ˚$

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A line segment AB is perpendicular to a line segment CD at their point of intersection O, write measures of ∠AOC

AB is given to be perpendicular to CD. It makes an angle of 90˚ at point O. Thus, ∠AOC=90˚

A line segment $A B$ is perpendicular to a line segment $C D$ at their point of intersection $O$ , write measures of $∠ A O C$

$A B$ is given to be perpendicular to $C D$ . It makes an angle of $90 ˚$ at point O.
Thus, $∠ A O C = 90 ˚$