Question

I need help with these two problems... PLZ HELP ME!!!!!!!

Answer 1

Answer:

3-B,E

4-. ( 1/8)×π×100

arc length of an enclosed circle is 2πr where r is the radius

the atc length of is proportional to the angle subtended at the centre . i.e for this arc it is 1/4th (90°/360°) of the arc length of an enclosed circle.

it is the same relationship with area of a sector