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tino4ka555 [31]
3 years ago
6

A circle has an area of 78.5 square inches. What is the diameter of the circle?

Mathematics
2 answers:
Reptile [31]3 years ago
8 0
The diameter is 10 square inches
qaws [65]3 years ago
8 0
The formula for the area of a circle is the following:

A =   \pi r^{2}

where A is the area and r is the radius of the circle. We also know that the diameter of a circle is twice the length of the radius, so you are able to determine the radius using the above formula, and then you can double it to get the diameter.
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In right triangle DEF, ∠E is a right angle, m∠D=26∘, and DF=4.5.
jok3333 [9.3K]

Answer:

The measurement of EF is 1.98 units

Step-by-step explanation:

In Δ DEF

∵ m∠E = 90°

∴ FD is the hypotenuse of the triangle

∵ m∠D = 26°

∵ EF is opposite to angle D

- We can use the sine ratio to find it

∵ sin D = \frac{EF}{FD} ⇒ (opposite side / hypotenuse)

∵ FD = 4.5 units

∴ sin(26) = \frac{EF}{4.5}

- Multiply both sides by 4.5

∴ 4.5 sin(26) = EF

∵ sin 26° ≈ 0.44

∴ 4.5(0.44) = EF

∴ 1.98 = EF

The measurement of EF is 1.98 units

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2 years ago
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Tresset [83]

Answer:

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Step-by-step explanation:

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3 years ago
What is half of 2/3 an
jek_recluse [69]

Answer:

0.3333

Step-by-step explanation:

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Mrs.Wang is 23 years older than her daughter. In 5 years, their ages will total 63. How old are they now
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Mrs. Wang is 55 years old and her daughter is 18 years old.
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Robert has 26 coins that are all nickels and dimes. The value of the coins is $1.85. How many of each does he have?
Ira Lisetskai [31]

Answer:

he has 11 dimes and 15 nickels

Step-by-step explanation:

i kept going down reducing the amount of dimes and adding to the amount of nickels and found that 11 dimes is $1.10 and 15 nickels is $0.75

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2 years ago
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