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20 POINTS! Please help, best answer will recessive brainliest answer points as well as 5 stars and a thank you. :)

20 POINTS Please help best answer will recessive brainliest answer points as well as 5 stars and a thank you class=

Respuesta :

Matheng

Answer:

Option 2. ⇒ x = 28

Step-by-step explanation:

Given that:

ΔABC , AB ≅ AC , m∠A = 3x  and m∠B = x+20

m∠B ≅ m∠C  because AB ≅ AC

So, m∠C = x+20

And we should know that, the sum of the interior angle of the triangle = 180

So, m∠A + m∠B + m∠C = 180

So, (3x) + (x+20) + (x+20) = 180

Solve for x

∴ 5x + 40 = 180

5x = 180 - 40 = 140

x = 140/5 = 28

So, the answer is option 2)  28