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| Hey! Let's solve the angle < ACB in this cube! | |
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| Yeah! Since the line segment AB is perpendicular to the sides of the base, you know that all the angles in the cube are 90 degrees. | |
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| Now that you know that, you can assume that all the sides of the cube are 1cm. | |
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| Next, you can label the corner where B and C meet as D. | |
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| Since you know that CD and BD are 1cm, you can use the Pythagorean Theorem to find out the length of CB. | |
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| After you apply the formula, you should get the length of CB to be the square root of 2. | |
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