Answer:
78°
Explanation:
You want the measure of base angle x in an isosceles triangle with a.pex angle 24°.
Base angle
The two base angles of an isosceles triangle are congruent. The sum of all angles is 180°, so we have ...
24° +2x = 180°
12° +x = 90° . . . . . . divide by 2
x = 78° . . . . . . . subtract 12°
The measure of angle x is 78°.