Calculate the area and perimeter of a ring where a = 7cm, b = 14cm WHO EVER WILL GIVE GOOD ANSWER WOULD ME MARKED AS BRAINLIST

hope that help you

Step-by-step explanation:

1.Circumference of circle = 2πr

Perimeter of ring = 2πr = 2 × 22/7 × 7 = 44 cm

Area of circle = πr²

Area of ring = πr² = 22/7 × 7 × 7 cm² = 154 cm²

2. Circumference of circle = 2πr

Perimeter of ring = 2πr = 2 × 22/7 × 14 = 88 cm

Area of circle = πr²  

Area of ring = πr² = 22/7 × 14× 14 cm² = 616 cm²

Im taking a and b as smaller and larger diameter haha

So for area we start by calculating a area of circumference with the larger diameter b and substracting another area with the diameter a:

(Pi×b²/4)-(Pi×a²/4)=Pi×196/4-Pi×49/4 = Pi×147/4 =115.39

For the perimeter we add the perimeter of both circles: Pi×a+Pi×b=Pi×7+Pi×14=Pi×21=65.94

answer: i believe c. is the answer sorry if i am wrong

step-by-step explanation: