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The measure of angle B is 120 degrees

What is rigid transformation

A rigid transformation is a type of transformation in geometry that preserves the size and shape of a figure.

When a rigid transformation is applied to a geometric object, the object's size and angles remain unchanged, and only its position and orientation in the plane are changed.

There are three main types of rigid transformations:

  • Translation
  • Rotation
  • Reflection

Reflection: This involves flipping the object across a line (mirror line). This is a type of rigid transformation hence the angles and size of the object is preserved

With this information we can say that angle B is 120 degrees

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