Respuesta :

Wallind11

Answer:

1)option b

2)option a

Step-by-step explanation:

1) circumference = 62.8 in

=> 2πr= 62.8

=> r= 62.8/(2×3.14)= 10 in

diameter = 2×10 in = 20 in

2)diameter = 14m

radius = 7 m

Area of the circle= πr² =3.14(7)²=3.14×49

= 153.86

=153.9 m²

S1NGH

Answer:

Q1) B

Q2) A

Step-by-step explanation:

Q1) The equation for working out the circumference of a circle is 2 × π × r or π × d, but here we are asked to do the reverse so,

π × d = 62.8

d = 62.8 ÷ π

d = 19.9

So the answer to the Q1) is 20 inches

Q2) We have to work out the area of the circle so we utilise the formula

π × r² . We only have the diameter but we can half it to find the radius so

14 ÷ 2 = 7. So 7 is the radius, now we substitute into the formula π × r²

3.14 × 7² = 153.86

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