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If \( \cos \angle B=\sin \angle A \) and \( m \angle A=32^{\circ} \), what is the measure of \( \angle B \) ?

Ask by Powell Osborne. in the United States
Feb 03,2025

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Answer

The measure of angle B is 58 degrees.

Solution

We are given: \[ \cos \angle B = \sin \angle A \quad \text{and} \quad m \angle A = 32^\circ \] First, compute \(\sin \angle A\): \[ \sin 32^\circ \] We know the co-function identity: \[ \sin \theta = \cos(90^\circ - \theta) \] Using this identity: \[ \sin 32^\circ = \cos(90^\circ - 32^\circ) = \cos 58^\circ \] Therefore: \[ \cos \angle B = \cos 58^\circ \] This implies: \[ \angle B = 58^\circ \quad \text{or} \quad \angle B = 360^\circ - 58^\circ = 302^\circ \] However, in the context of typical geometrical problems (such as within a triangle), angles are usually between \(0^\circ\) and \(180^\circ\). Thus, the measure of \(\angle B\) is: \[ \boxed{58^\circ} \]

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To solve the problem, we start with the given information: We have \( \cos \angle B = \sin \angle A \) and \( m \angle A = 32^{\circ} \). Since \( \sin \angle A = \sin 32^{\circ} \), we can use the co-function identity of sine and cosine, which states: \[ \sin \theta = \cos(90^\circ - \theta) \] Thus, we can write: \[ \sin 32^{\circ} = \cos(90^\circ - 32^{\circ}) = \cos 58^{\circ} \] Now, substituting this back into our equation, we have: \[ \cos \angle B = \cos 58^{\circ} \] The solution for \( \angle B \) could be: \[ \angle B = 58^{\circ} \quad \text{or} \quad \angle B = 360^\circ - 58^\circ = 302^\circ \] Since we are looking for an angle typically measured in [0°, 180°], we take: \[ \angle B = 58^{\circ} \] Therefore, the measure of \( \angle B \) is \( \boxed{58^\circ} \).

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