alleryꯌꯥꯑꯣꯔꯤꯕꯥ ꯑꯦꯉ꯭ꯒꯜ ꯑꯗꯨ ꯀꯔꯤ ꯑꯣꯏꯔꯀꯄꯥ ꯃꯇꯃꯗꯥ ꯀꯣꯁꯥꯏꯅꯁꯤꯡꯒꯤ ꯂꯣ ꯑꯁꯤ ꯄꯥꯏꯊꯥꯒꯣꯔꯤꯌꯟ ꯊꯤꯑꯣꯔꯤꯃꯗꯥ ꯍꯟꯊꯔꯀꯏ?
A90°
B180°
C0°
D60°
Answer & Solution
Correct answer: A. 90°
90 ꯗꯤꯒ꯭ꯔꯤꯗꯥ cos C ꯑꯁꯤ ꯖꯤꯔꯣꯅꯤ, ꯃꯁꯤꯅꯥ ꯀ꯭ꯔꯣꯁ ꯇꯔꯝ ꯑꯁꯤ ꯂꯧꯊꯣꯀꯏ ꯑꯃꯁꯨꯡ c ꯁ꯭ꯀꯣꯌꯥꯔ = a ꯁ꯭ꯀꯣꯌꯥꯔ + b ꯁ꯭ꯛꯕꯥꯔ ꯊꯥꯗꯣꯀꯏ꯫
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