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Simple Geometry quiz
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10 Replies
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69
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My head hurts already. We know the total angle in the bottom left is the same as in the bottom right = 80. Law of Sines or Law of Cosines should be used, I suppose. This is assuming the base line is equal to the distance from the apex down the far right line to where the second apex occurs.
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I’m going with 30 degrees.
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42
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Key to solving this is that 80 – 20 = 60.
BTW, 30 degrees is correct, by elementary geometry.
GB
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Hmmm. Wouldn’t 45 also be correct?
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No it wouldn’t. Rheumy old eyes didn’t see the congruent segments.
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Wouldn’t 45 also be correct?
I draw it up in CAD and confirm that 30° is the answer. Waiting for the simple geometry method.Â
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@norman-oklahoma
Start by drawing an equilateral triangle that includes the long side to the left.
Then recall the hint about 60 degrees.
GB
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