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Anton [14]
3 years ago
15

The circumference of circle C is 90 cm. What is the length of AB (in red)? Help please

Mathematics
2 answers:
VMariaS [17]3 years ago
7 0

Answer:

30cm

Step-by-step explanation:

a circle is 360 degrees

120/360 = 1/3 the circumference

90 cm * 1/3 = 90 / 3 = 30

Ugo [173]3 years ago
5 0

Answer:

30 cm

Step-by-step explanation:

The length of the arc AB is calculated as

circumference × fraction of circle subtended by AB, that is

AB = 90 × \frac{120}{360}

     = 90 × \frac{1}{3} = 30 cm

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Answer:

Cheryl's age = x = 7 years

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Step-by-step explanation:

Let

Cheryl's age = x

Rita's age = y

Two years ago, Rita was three times older than Cheryl

(y - 2) = 3(x - 2)

y - 2 = 3x - 6

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(y + 3) = 2(x + 3)

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y = 2x + 6 - 3

= 2x + 3

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Collect like terms

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Substitute x = 7 into

y = 2x + 3

= 2(7) + 3

= 14 + 3

= 17

y = 17 years

Cheryl's age = x = 7 years

Rita's age = y = 17 years

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