Q2 of 80 Page 295

Soma has drawn a right angled triangle ABC whose ABC = 90, AB = 24 cm. and BC = 7 cm. By calculating, let us write the value of sinA, cosA, tanA and cosec A.

Given, AB = 24, BC = 7


Need to find the values of sinA, cosA, tanA and cosecA


⇒ [from the figure, AC is hypothesis, AB is base and CB is perpendicular]


⇒ AC2 = AB2 + BC2


⇒ AC2 = (24)2 + (7)2


= 576 + 49


= 625


⇒ AC2 = 625


⇒ AC = 25


⇒


=


=


= 0.28


⇒ sinA = 0.28


⇒


=


=


= 0.96


⇒ cosA = 0.96


⇒


=


=


= 0.29


⇒ tanA = 0.29


⇒


=


=


= 3.57


⇒ cosecA = 3.57


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