Respuesta :

jesslevy
It’s 1/4 because its a 90 angle and 90/360 can be simplified to 1/4
Catya
You can solve this using ratios. A full circle is 2π radians.
arc radians ÷ full circle radians = fraction of circle

π/2 ÷ 2π = 1/4

It's a fourth of the circumference

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