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4 years ago

Please help!!!!!!!!!!

Mathematics

1 answer:

sammy [17]4 years ago

4 0

Find the length of AB
AB²=20²+15²
AB²=400+225
AB²=625
AB=25

then find AD and BD
20²=AD·25
400=AD·25
AD=16
15²=BD·25
225=BD·25
BD=9
now use the geometric mean theorem (name?) to find CD
CD=√(9·16)
CD=√144
CD=12 cm

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Step-by-step explanation:

Comment

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If the exterior angle is 25o then the interior angle is its supplement.
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I'm hoping you get an answer besides mine. I can take you so far.
The formula for an interior angle is

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You can google equiangular polygon theorem to see where I got the formula. The problem is that I really don't know how to interpret the answer. It looks like you have 14 conguent sides and 1 that is 0.4 left over. The figure might still be equiangular.

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Answer:

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Step-by-step explanation:

Given

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