D 18. Using the adjoining figure, calculate the values of : (i) cos (ii) tano (iii) coseco [Hint. Draw CE I AD.] 14 units 13 units C 2
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Answer:
We know, by angle sum property, the sum of angles of triangle =180
o
Then, a+110
o
+32
o
=180
o
⟹ a+142
o
=180
o
a=180
o
−142
o
=38
∘
.
Thus measure of angle a is 38
o
.
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