Answer:
Measure of three angles of Isosceles Triangle are ,55°, 55°, and 70°.
Length of side across 80° angle = 10 inches
We will use Sine Rule Here, which states that
[tex]\frac{a}{sinA}=\frac{b}{sinB}=\frac{c}{sinC}\\\\ \frac{10}{sin 70}=\frac{b}{sin 55}=\frac{c}{sin 55}\\\\ \frac{10}{0.974}=\frac{b}{0.8191}=\frac{c}{0.82}\\\\ b=\frac{8.2}{0.974}=8.418\\\\c=8.418[/tex]
Length of other sides = 8.41 inches
Option D: 8.19 inches
