C=15.7 ft The formula for the circumference of a circle is with the given circumference use 3.14 for π and round to the nearest tenth of a unit if necessary

Solution:

Given that,

Circumference of circle = 15.7 feet

The formula for the circumference of a circle is:

Where, "r" is the radius of circle

Given that,

C = 15.7 feet

Therefore,

Thus radius of circle is 2.5 feet

Also,

Diameter = 2( radius )

Diameter = 2 (2.5) = 5

Thus diameter of circle is 5 feet

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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step-by-step explanation: