F 1 2, Deg), Fix) – Casio fx-570MS User Manual
Page 9
– 6 –
Circles and Sectors
Example 2
Example 2
Operation
Determine, up to one decimal place, the length of the arc
and area of a sector that has a radius of 6 cm and a
central angle of 240
°.
(Radius =
r
, central angle =
a
°)
Length of the arc of a sector:
l
= 2
π
r
×
Area of a sector: S =
π
r
2
×
1
.
Enter the COMP Mode.
F 1
2
.
Press the
F
key a number of times until degrees (Deg) are specified as the angle unit.
F
• • •
1
(Deg)
]
3
.
Press the
F
key a number of times until 1 (Fix1) is specified as the fixed number of decimal
places.
F
• • •
1
(Fix)
1 ]
4
.
Determine the length of the arc of the sector.
2
A x -
6
- R 240 \ 360 T =
The length of the arc of the sector is approximately 25.1 cm.
5
.
Calculate the area.
A x -
6
K - R 240 \ 360 T =
The area is approximately 75.4 cm
2
.
FIX
FIX
Explanation
Explanation
a
360
a
360
240
°
6 cm