__maths__>__Construction / Practical Geometry (basics)__>__Basic Shapes: Lines, Circles, Angles__### Copying an angle

In this page, a short and to-the-point overview of constructing an angle by copying another angle is provided.

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Which of the following property helps to copy an angle using compass?

- two triangles with identical sides have identical angles
- two triangles with identical sides have identical angles
- no property of triangle can be used to copy an angle

The answer is "two triangles with identical sides have identical angles"

Given `/_ BAC`. To copy this angle, make a triangle of random sides `/_\ APQ`. Copy the length of line segment `bar(AQ)` to mark point `L` on the given line. Copy the lengths of line segments `bar(AP)` and `bar(QP)` to mark `M` from points `X` and `L` respectively. Join the points `X` and `M`. The angle `/_BAC` is reproduced in `/_LXM`.

**Copying a Given Angle** : Mark a triangle in the given angle and reproduce the sides of a triangle which copies the angle.

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