A circular placemat has 44 inches of braid around the edge. What is the area of the placemat to the nearest square inch? Use 3.14 for π.

Question

A circular placemat has 44 inches of braid around the edge. What is the area of the placemat to the nearest square inch? Use 3.14 for π.

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Cherry 3 years 2021-09-05T11:56:31+00:00 2 Answers 8 views 0

Answers ( )

  1. taiduc
    0
    2021-09-05T11:57:44+00:00
    Reply

    Answer:

    a ~ 154

    a = \frac{484}{(pi)}

    Step-by-step explanation:

    1. Approach

    In this problem, one is given the circumference, the distance around the circle, one must find the area. In order to find the area, one must know the radius of the circle. To find the radius, one has to backsolve from the given circumference, then substitute the derived value into the formula for the area and solve.

    2. Find the radius

    The formula to find the circumference of a circle is;

    2r(pi)=c

    Where (r) is the radius, (pi) is (3.1415), and (c) is the circumference.

    Substitute in the given values and solve;

    2r(pi) = c\\2r(pi) = 44\\r=\frac{44}{2(pi)}\\r=\frac{22}{(pi)}

    3. Find the area

    Now, one has the value of the radius, substitute it into the formula for the area of a circle and solve;

    The formula for finding the area of a circle;

    (pi)r^{2}=a

    Where (pi) is (3.1415), (r) is the radius, and (a) is the area,

    Substitute in the value and solve.

    (pi)r^{2} = a\\(pi)(\frac{22}{(pi)})^{2}=a\\\frac{(22)^{2}}{(pi)}=a\\\frac{484}{(pi)}=a

    a ~ 154

  2. Sigrid
    0
    2021-09-05T11:58:05+00:00
    Reply

    Answer:  approximately 154 square inches

    ==========================================================

    Explanation:

    We’ll need to use the circumference formula

    C = 2*pi*r

    to find the value of the radius r when C = 44

    So we get

    C = 2*pi*r

    44 = 2*3.14*r

    44 = 6.28*r

    6.28r = 44

    r = 44/6.28

    r = 7.0063694267516

    which is approximate

    Then we use this value of r to find the area we need

    A = pi*r^2

    A = 3.14*(7.0063694267516)^2

    A = 154.140127388536

    A = 154

    The area of the circular placemat is approximately 154 square inches.

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