Question

If sin tha=20/29 then find cos tha​

Answer 1

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Answer 2

Step-by-step explanation:

. We know a right angled traingle have three sides we call them Perpendicular ,Base and Hypotenuse.

.Hypotenuse=> It is called as the sum of other two sides or sq.of both the sides. It is the biggest side.

. Perpendicular=>It is the height from the top of the triangle to the base and it is of 90°.

.Base =>The distance or the side below of the triangle is known as its base.

We know.

i.(H)^2=(B)^2+(P)^2.

ii.(B)^2=(P)^2-(H)^2.

iii.(P)^2=(B)^2-(H)^2.

Sin theta=P/H or Perpendicular /Base.

So, Use pythogerous theorem to find its base

==>(H)^2=(B)^2+(P)^2

==>(29)^2=(B)^2+(20)^2.

==>841=(B)^2+400.

841-400=>(B)^2

441==>(B)^2

(B)^2==>√441

Base==>21cm.

Hence the sides of this Right angled triangle are 29,20,21.

We know,Cos theta=B/H or Base/Hypotenuse.

So,Cos theta =21/29