1.

In a right-angled triangle, the difference between the two acute angles is `(pi/15)^(c )`. Find the angle in degrees.

Answer» Clearly, the sum of the two acute anles of a right triangleis `90^(@)`.
Difference between the acute angles `= (pi/15)^(c )= (pi/15 xx 180/pi)^(@) = 12^(@)`.
Let the two acute be `x^(@)` and `y^(@)` . Then,
`x + y= 90 "…….."(i)`
`x- y = 12 "............" (ii)`
Solving (i) and (ii), we get `x = 51` and `y = 39`.
Hence, the angles of triangleare `51^(@), 39^(@)` and `90^(@)`.


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