Find the degree measure corresponding to the following radian measures (Use π =
)
(i) 
(ii) -
(iii) 
c (iv) (-3)c (v) 11c (vi) 1c
We know that π rad = 180° ⇒ 1 rad = 180°/ π
(i) Given 
= (36 × 9) °
= 324°
(ii) Given 
= (30 × -5) °
= -(150) °
(iii) Given 
= (36 × 18) °
= 648°
(iv) Given (-3) c
= -(171° 49’ 5.45”)
≈ -(171° 49’ 5”)
(v) Given 11c
= (90 × 7) °
= 630°
(vi) Given 1c
= (57° 16’ 21.81”)
≈ (57° 16’ 22”)
1