# Geometry multiple choice question can anybody help me??

Obtuse and

- Triangle
#a=16, b=30, c=38,# acute, obtuse or right?The biggest angle is opposite the biggest side. Let's calculate its cosine using the Law of Cosines.

#c^2 = a^2 + b^2 - 2 a b cos C# #cos C = {a^2 + b^2 - c^2}/{2ab} = {16^2+30^2+38^2}/{2(30)(38)} = -12/95# It's negative, so

#C>90^circ# , an obtuse triangle. The sign was determined by the numerator, interestingly turning the Pythagorean Theorem into a triangle classifier.- In 45/45/90 triangle, the second biggest cliche in trig, the legs are equal:
# x^2 + x^2 = 13^2 # #2x^2 = 13^2 # # x = 13/sqrt{2} = 13/2 sqrt{2}#

- In 45/45/90 triangle, the second biggest cliche in trig, the legs are equal:

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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