1.

12 An extension angle of a triangle mecane 120° and its interios angles are in the radio 7:5 · find the angles of the triangle.​

Answer»

ong>Answer:

70°, 50° and 60°

Explanation:

LET the COMMON RATIO be x.

therefore interior angles are 7x and 5x

we know that exterior angle is sum interior angles

7x + 5x = 120°

12x = 120

x = 10°

therefore the angles are

7x = 70°

5x = 50°

and the third angle = 180 - (70+50) [angle sum PRO.]

= 60°



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