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3 years ago

A flying disc has 4 3/4 inch radius. What is its circumference to the nearest inch?

Mathematics

2 answers:

Bumek [7]3 years ago

7 0

Answer:

30 inches

Step-by-step explanation:

If a flying disc has 4 3/4 inch radius, its circumference to the nearest inch is 30 inches.

Formula: C=2πr

C=2πr=2·π·4 3/4≈30

Anastasy [175]3 years ago

3 0

To find the circumference, multiply the radius by 2, then multiply by PI.

4 3/4 x 2 = 9 1/2

9 1/2 x PI = 9 1/2 x 3.14 = 29.83

Rounded to the nearest inch = 30 inches.

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Multiply (5 + 3i)(5 − 3i) 16 + 15i 16 − 15i 16 34

Annette [7]

Answer:

(5 + 3i)(5 − 3i) = 34

Step-by-step explanation:

The multiplication of two identical binomials who have different symbol, can be solved using the factoring case of a difference of squares:

$(a-b).(a+b)=a^{2}-b^{2}$

So, in this case:

$(5+3i).(5-3i) = 5^{2}-(3i)^{2}$

$=25-9i^{2}$

Remember that $i=\sqrt{-1}$

So: $i^{2}=-1$

We replace on the polynomial:

$=25-9.(-1) = 25+9=34$

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4 years ago

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Could you pls teach me this question

Alexandra [31]

Answer:

if it's area the area would be the length of the diameter of the semi circle which is the height of the triangle multiplied by the base of the triangle to find the area of the triangle then to find the area of the circle would be pie multiplied by the diameter divided by two squared

$\pi \ \times 7 {}^{2}$

then the total area would be the area of the triangle plus the area of the half circle

7 0

3 years ago

PTG has side lengths of 18 cm, 27 cm, and 13 cm. which type of triangle is PTG? The answer is obtuse.

Verizon [17]

To know what kind of triangle is it. use the pythagorean theorem:
A^2 + B^2 = C^2,
where C is the longest side of the triangle
if it satisfies the equation then it is a right triangle
if it does not then A^2 + B^2 > C^2 so it is acute triangle
if A^2 + B^2 < C^2 it is obtuse triangle

18^2 + 13^2 ? 27^2
324 + 169 ? 729
493 < 729 so it is obtuse triangle

3 0

3 years ago

What is the exact value of cos 45° ?

Georgia [21]

Let the two sides of a right triangle be equal to one, which means that the hypotenuse is √2

Since cosa=adjacent side / hypotenuse

cos45=1/√2

We can rationalize the denominator by multiplying numerator and denominator by √2

√(2)/2

or if you prefer: √(1/2)

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3 years ago

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A rectangle is a rhombus.

Soloha48 [4]

False. It’s a quadrilateral.

4 0

3 years ago

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