Question

Express 2/3 of a straight angle into radian?

Answer 1

• Straight angle=180°

`\\ \sf\longmapsto (2)/(3)\:of\:180`

`\\ \sf\longmapsto (2)/(3)* 180`

`\\ \sf\longmapsto 2(60)`

`\\ \sf\longmapsto 120`

Convert to radians

`\\ \sf\longmapsto 120* (\pi)/(180)`

`\\ \sf\longmapsto (2\pi)/(3)rad`