1.

The angle of a sector of a circle is `90^(@)`. The ratio of the area of the sector and that of the circle is ______.A. `4:1`B. `3:1`C. `1:4`D. `3:1`

Answer» Correct Answer - C
`"Area of circle"=pir^(2)`
`"Area of sector"=(90^(@))/(360^(@))xxpir^(2)`
`"The required ratio "=(90^(@))/(360^(@))xxpir^(2):pir^(2)rArr(1)/(4):1`
`rArr 1:4`


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