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makkiz [27]
4 years ago
11

What is the measurement of A?

Mathematics
1 answer:
stealth61 [152]4 years ago
6 0

Answer:

∠A=-4X+170°

Step-by-step explanation:

IN triangle some of all the angle is 180°

hence in triangle ABC

∠A+∠B+∠C=180°

GIVEN ∠A=X+20° ∠B=3X-10°

HENCE ∠A+3X-10°+X+20°=180°

∠A+4X+10°=180°

∠A=-4X+170°

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