Answer:
(1) 2π - x² = 0 (2) x = 2.5 cm (3) perimeter = 10 cm
Step-by-step explanation:
(1)The area of the circular coin without the inner square removed is πr² where r = 3 cm is the radius of the coin. So, the area of the coin without the inner square removed is πr² = π(3 cm)² = 9π cm²
The area of the square of x sides removed from its center is x².
The area A of the each face of the coin is thus A = 9π - x²
Since the area of each face of the coin A = 7π cm²,
then
7π = 9π - x²
9π - 7π - x² = 0
2π - x² = 0
(2) Solve the equation 2π - x² = 0
2π - x² = 0
x² = 2π
x = ±√(2π)
x = ± 2.51 cm
Since x cannot be negative, we take the positive answer.
So, x = 2.51 cm
≅ 2.5 cm
(3) Find the perimeter of the square
The perimeter of the square, p is given by p = 4x
p = 4 × 2.51 cm
= 10.04 cm
≅ 10 cm
87. Because 3*3*3*3 is 81 and 570/6 is 95 and 87/7 is 12 R 3
Find out what angle it is. then add all sides abs subtract the total degrees and it’s your answer!
Yes, 2.8 cm, 4.0 cm, and 2.8 cm could be the side lengths of a triangle ⇒ B
Step-by-step explanation:
In any triangle:
- The sum of any two sides is greater than the third side
- Add the smallest two numbers if their sum is greater than the largest number, then the numbers can formed the lengths of sides of a triangle
∵ The lengths of the segments are 2.8 cm , 4.0 cm and 2.8 cm
∵ The smallest segments are 2.8 cm , 2.8 cm
- Find their sum
∴ The sum of their length = 2.8 + 2.8
∴ The sum of their length = 5.6 cm
The length of the largest segment is 4.0 cm
∵ 5.6 cm > 4 cm
∴ 2.8 cm , 4.0 cm , 2.8 cm can formed a triangle
Yes, 2.8 cm, 4.0 cm, and 2.8 cm could be the side lengths of a triangle
Learn more:
You can learn more about the triangles in brainly.com/question/10677255
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Answer:
the answer is 6 in hope this you