The base angle of an isosceles triangle measures 54°. what is the measure of its vertex angle?

a. 27°
b. 36°
c. 54°
d. 72°

d. 72°

Step-by-step explanation:

The sum of the angles presented add up to be 108°, and the sum of all three should be 180°.

Knowing this, we subtract 108 from 180

108°-180°=72°

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~Steve

d. 72 degrees.

Step-by-step explanation:

The 2 base angles in an isosceles triangle are equal so their sum is 2*54 = 108.

Thus the vertex angle = 180 - 108

= 72 degrees.

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.

explanation:

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