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Pani-rosa [81]
3 years ago
8

What is the value of y? Enter your answer in the box.

Mathematics
2 answers:
ELEN [110]3 years ago
6 0

Answer:

y=20^o

Step-by-step explanation:

We can see from our given triangle that it has two equal sides. This means that the angles corresponding to these sides will be of equal measure.

m\angle C=m\angle B  

Upon substituting our given values we will get,

m\angle C=25^o

Since the measure of all the angles of a triangle is 180 degrees.

m\angle A+m\angle B+m\angle C=180^o

Now let us substitute the measures of our given angles.

3y+70+25+25=180

3y+120=180

3y+120-120=180-120

3y=60

Let us divide both sides of our equation by 3.

\frac{3y}{3}=\frac{60}{3}

y=20

Therefore, the value of y is 20 degrees.

Dennis_Churaev [7]3 years ago
5 0
You must know that the sum of interior angles is 180°. We also know that AC and BA are congruent which means angles B and C are also congruent. To find x we can assume 25=5x. Which makes x=5, and angle C=25°.

Then we can add all the angles to find y and A. 25+25+(3y+70)=180. Then solve for y and then solve for angle A.
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