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widnickab
16.07.2019 •
Mathematics
Suppose an isosceles triangle abc has a = 45° and b = c = 4. what is the length of a2? a.22.63 b.54.63 c.9.37 d.3.10
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Ответ:
Since b = c, the angles B and C also equal
so you get
180 - 45 = 135
135/2 = =67.5 for each angle
now we know 2 sides and all 3 angles, use the law of sines to find a
b/sin B = a/sin A
4/(sin 67.5) = a/(sin 45)
a = 4(sin 45)/(sin 67.5)
a^2 = (4(sin 45)/(sin 67.5))^2
a^2 = 9.37
Answer is C
Ответ:
B, and C. Let me know if i am wrong.
Step-by-step explanation: