Geometry only answer if you know

Question

asked Jul 10, 2022 49.5k views

1 Answer

Jdgregson · Answer 1 · 2022-07-15T07:30:47+0000

Given :

Sum of all angles in a triangle = 180°

Which means :

$= \tt61 + 15x - 1 = 180$

$=\tt 61 - 1 + 15x = 180$

$=\tt 60 + 15x = 180$

$= \tt15x = 180 - 60$

$=\tt 15x = 120$

$= \tt \: x = (120)/(15)$

$=\tt x = 18$

Measure of angle 15x-1 :

$= \tt15 * 8 - 1$

$=\tt120 - 1$

$=\tt 119$

Thus, the measure of angle 15x-1 = 119°

Let us place 8 in the place of x to see if we have found out the correct measure of the angles :

$= \tt40 + 21 + 119 = 180$

$= \tt61 + 119 = 180$

$=\tt 180 = 180$

Since the measures of all the angle sum up to form 180°, we can conclude that we have found out the correct measure of each of the angles.

Therefore, the value of x = 8

$\boxed{\color{plum}\bold{x = 8}}$