area a circle
A is in the shape of a quarter circle of a radius of 15cm. B is in the shape of a circle. the area of shape A is 9x the area of B. show that the radius of B is 2.5cm
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I just dont understand it can you go over the steps please?
Original post by midnightsprinkle
A is in the shape of a quarter circle of a radius of 15cm. B is in the shape of a circle. the area of shape A is 9x the area of B. show that the radius of B is 2.5cm
Start by working out the area of A
ok did it
i got 706.85
i dont know to be honest!
do you divide 706.85 by 9??
Original post by midnightsprinkle
do you divide 706.85 by 9??
Yes. Remember though A is only a quarter of a circle so you need to do something with that first
i got 78.53, but i rounded it down to 78.50
Original post by midnightsprinkle
i got 78.53, but i rounded it down to 78.50
you can then divide that by 4 as a is a quarter of a circle.
i got 19.60
Original post by midnightsprinkle
i got 19.60
So 19.6 is equal to what?
Original post by midnightsprinkle
i got 19.60
ok, so then 19.6 = pi r squared for circle b...
you can work out the radius now
(edited 1 year ago)
shape B??
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