i need with my assignment pls i dont understand something

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[grave sun]

this is the question The diagram shows a sector of a circle of radius 12cm with an angle of 135°.
Calculate the perimeter of the sector.

ik that you use formula for an arc length there is one thing that troubles me its since 0 is the central angle of the sector which is 135 degress 135degrees divided 360 if you divide those it wont the 3/8 answer which troubles me

[tribal viper]

A circular sector's boundary consists of three pieces: two radii and an arc. So:
P(sector) = L(arc) + 2R = θR + 2R = (θ + 2)R

[grave sun]

ik that but that doesntt solve the issue

[tribal viper]

I don't quite understand what the issue is.

[grave sun]

ok wait

@tribal viper

its stressful

[tribal viper]

Well, what's wrong with that?

[grave sun]

i dont quite understand

[tribal viper]

The arc length is L = θR = (πθ/180°)R. What's the problem?

[grave sun]

To understand why 135/360 simplifies too 3/8 we need to simply the fraction by finding the greatest common divisor of both denominator and numerator l found out on yt