Trig Function Problem (1 Viewer)

[Nasonex]

1) The arc length when a secot of a circle is subintended by an angle of pie/5 at the centre 3pie/2 metres. Find the radius of the circle.

2) The radius of a circle is 3cm and an arc is 2pie/7 cm long. Find the angle subintended at the centre of the cicle by the arc.

 

[watatank]

1) The arc length when a secot of a circle is subintended by an angle of pie/5 at the centre 3pie/2 metres. Find the radius of the circle.

l = r@

r = l/@
= (3pi/2) / (pi/5)
= 15/2

2) The radius of a circle is 3cm and an arc is 2pie/7 cm long. Find the angle subintended at the centre of the cicle by the arc.

l = r@

@ = l/r
= (2pi/7) / (3)
= 3pi/7