Help me please for brainliest!
2 answers:
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
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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