4) Measure of an arc of a sector of a circle is 90 degree and its radius is 7cm. Find the perimeter of the sector.
How to find solution?
Suggest any formula or reason for it.
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Perimeter of the sector means........radius+radius+length of the arc.
solution:
find the length of arc.
it will be 11 cm.
use the formula for perimeter.
2 (radius)+perimeter
=2 (7)+11
=14+11
=25.
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