3 years ago

What is the exact value of sin(15)

Mathematics

2 answers:

WARRIOR [948]3 years ago

8 0

<span>the answer is 0.65028784015 </span>

Nutka1998 [239]3 years ago

8 0

The correct answer is √6-√2/4, or B.

I just took the unit test review and got it correct :)

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Which set of lengths are not the side lengths of a right triangle? (A-28, 45, 53) (B-13, 84, 85) (C-36, 77, 85) (D-16, 61, 65) [

nikklg [1K]

Side lengths 16, 61, and 65 are not part of a right triangle.

A right triangle's sides should follow this formula, C being the largest number:

$a^{2} + b ^{2} = c^{2}$

$16^{2} = 256$

$61^{2} = 3721$

$65^{2} = 4225$

256 + 3721 = 3977

$3977 \neq 4225$

6 0

3 years ago

The perimeter of △CDE is 55 cm. A rhombus DMFN is inscribed in this triangle so that vertices M, F, and N lie on the sides CD ,

ivanzaharov [21]

Answer:

CD = 14 cm; DE = 21 cm

Step-by-step explanation:

The perimeter is the sum of side lengths (in centimeters), so ...

CD + DE + CF + EF = 55

CD + DE + 8 + 12 = 55 . . . . . . . substittute for CF and EF

CD + DE = 35 . . . . . . . . . . . . . . subtract 20

___

The segment DF is a diagonal of the rhombus, so bisects angle D. That angle bisector divides ΔCDE into segments that are proportional. That is, ...

CD/DE = CF/EF = 8/12 = 2/3

___

So, we have two segments whose sum is 35 (cm) and whose ratio is 2 : 3. The total of "ratio units is 2+3=5, so each must stand for a length unit of 35/5 = 7 (cm). The sides are ...

CD = 2·7 cm = 14 cm

DE = 3·7 cm = 21 cm

<em>Check</em>

CD + DE = (14 +21) cm = 35 cm . . . . . matches requirements

7 0

4 years ago

Tina says that 3.4 x 105 is greater than 8.25 x 104. Is she correct? Justify your answer.

Anna71 [15]

Answer:

No, Tina is not correct since 3.4 × 105 = 357 and 8.25 × 104 = 858

6 0

3 years ago