Question

A triangle has angle measures of 42°, 51°, and `x`°. What is `x`?

Answer 1

`x=87`

Explanation:

The measure of three angles of the given triangle are `42^@`, `51^@` and `x^@`.

We know that the sum of all the angles of any triangle is `180^@`

`implies 42^@+51^@+x^@=180^@`

`implies x^@=180^@-(42^@+51^@)=180^@-93^@=87^@`

`implies x^@=87^@`

`implies x=87`