Let us take a right triangle ABC right angled at B as shown
Here, (or, in brief, angle A ) is an acute angle. Note the position of the side BC with respect to angle A. It faces . We call it the side opposite to angle A or perpendicular with respect to angle A.. AC is the hypotenuse of the right triangle and the side AB is a part of , So , we call it the side adjacent to angle A or base with respect to angle A Note that the position of sides change when you consider angle C in place of A We now define certain ratios involving the sides of a right triangle, and call them trigonometric ratios. The trigonometric ratios of the angle A in right triangle ABC are defined as follows: |
Illustration: ABC is a right angled triangle.If AB = 3 cm, BC= 4 cm and CA = 5 cm and .
Solution: In the figure we have a right angled triangle ABC right angled at B and we know that by the definition
Find the value of When it is given that | |||
Right Option : C | |||
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Find the value of when it is given that | |||
Right Option : B | |||
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ABC is a right angled triangle.If AB = 21cm, BC= 20cm and CA = 29cm and . | |||
Right Option : D | |||
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