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Andrej [43]
3 years ago
13

In triangle ABC, m∠ABC = (4x – 12)° and m∠ACB = (2x + 26)°. Yin says that if x = 19, the triangle must be equilateral. Is he cor

rect? Justify your answer
Mathematics
2 answers:
Agata [3.3K]3 years ago
7 0

No, Yin is not correct. If  x = 19, the measure of angle ABC = 4(19) – 12 = 64. Therefore, the two base angles measure 64°. An equilateral triangle is equiangular, so each angle would have to measure 60° because there are 180° in a triangle.

Pepsi [2]3 years ago
5 0
If x = 19   m∠ABC = (4.19 – 12)°=64°, and <span>m∠ACB = (2.19 + 26)°=64°
so the other angle can be found with
</span>m∠ABC + m∠ACB + <span>m∠CAB =180°
</span> m∠CAB =180°-m∠ABC -<span>m∠ACB =180°-128°=52°
</span>so the triangle is not aquilateral, 
he was wrong
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