Give two concentric circles of radius 4 and r, find the value of r if two arcs of the same length on the two concentric circles subtend angles of 45o and 60o at the centre.
2 units
3 units
4 units
5 units
80o 33' 20'' = ____________.
145π/324 radians
150π/300 radians
156/300 radians
224π/325 radians
63o = ___________.
75 grades
65 grades
60 grades
70 grades
An arc 15feet long describes an angle of 5 radians at the centre of a circle.Then the radius of the circles is
3 feet
2 feet
5 feet
7 feet
π/3 radians =
12o
57.3o
60o
30o
If π = 22/7 then the approximate value of 1 radian is
58o 16' 13''
57o 15' 14''
59o 16' 17''
57o 16' 12''
2π/9 radians = _________.
45o
37o
40o
50o
If the arcs of the same length in two circles subtend angles of 60o and 75o at the centre then the ratio of their radii is
3 : 2
2 : 5
5 : 3
5 : 4
Express in radians, the measure of the internal angles of a pentagon
(2π/5) radian
(3π/5) radian
(4π/3) radian
(4π/5) radian
15o 28' 32'' + 12o 32' 58'' =
27o 1' 30''
28o 20''
28o 1' 30''
28o 5' 30''