Question

Find the value of x in the isosceles triangle shown bellow.​

Answer 1

Answer: D

Explanation:

The dotted line is the altitude, since this is an isosceles triangle, it spits the bottom line in half and forms a right angle so you can use the pythagorean theorem.

`a^(2) +b^(2) = c^(2)`

`a^(2) + (4)^(2) =(√(20))^(2)`

simplify

`a^(2) +16=20`

subtract 16 from both sides

`a^(2) =4`

square root both sides

`a=2`