Question

Suppose an isosceles triangle ABC has `A=30°` and `b=c=5`. What is the length of `a^2`?

Answer 1

`a^2=6.7`

Explanation:

`B=C=(180-30)/2`
or
`B=C=150/2`
or
`B=C=75^@`
`5/sin75=a/sin30`
or
`a=5sin30/sin75`
or
`a=2.58`
or
`a^2=6.7`