Q3 of 80 Page 295

If in a right angled triangle ABC, ∠C=90°, DC = 21 unit and AB = 29 units, then let us find the values of sinA, cosA, sinB and cosB.

Given, BC = 21 and AB = 29


Need to find the values of sinA, cosA,sinB,cosB


⇒ and


⇒ AB2 = AC2 + BC2


⇒ (29)2 = AC2 + (21)2


⇒ 841 = AC2 + 441


⇒ 400 = AC2


⇒ AC = 20


⇒


= = 0.72


⇒


= = 0.68


⇒


= = 0.68


⇒


= = 0.72


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