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2 years ago

PLEASE HELP!

Mathematics

2 answers:

Andrej [43]2 years ago

3 0

Answer:

For the circle with the diameter of 7cm, the area is about 38.48cm and the circumference is about 22cm

For the circle with the diameter of 5cm, the area is about 19.63cm and the circumference is about 15.7cm

Step-by-step explanation:

The formula to find the area of a circle is pi*r^2

The formula to find the circumference is 2*pi*r

r = radius, which can be determined simply by taking the diameter, and dividing it by 2.

Alexxandr [17]2 years ago

3 0

Answer:

See below ~

Step-by-step explanation:

Circle 1 :

Area = πr² = 22/7 x (7/2)² = 11 x 7/2 = 77/2 = 37.5 cm²
Circumference = 2πr = 2 x 22/7 x 7/2 = 2 x 11 = 22 cm

Circle 2 :

Area = πr² = 22/7 x (5/2)² = 22/7 x 25/4 = 550/28 = 19.64 cm²
Circumference = 2πr = 2 x 22/7 x 5/2 = 220/14 = 15.71 cm

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