Write down the type of each angle below. a) $198^{\circ}$ b) $26^{\circ}$ c) $164^{\circ}$ d) $94^{\circ}$

Step 1 ：Determine the type of each angle based on its degree measure: Acute angle (0-90 degrees), Right angle (90 degrees), Obtuse angle (90-180 degrees), Invalid angle (greater than 180 degrees).

Step 2 ：a) \(198^\circ\): Invalid angle, b) \(26^\circ\): Acute angle, c) \(164^\circ\): Obtuse angle, d) \(94^\circ\): Obtuse angle