Round 4.77 to the nearest whole number.

I need help finding bc and ac

Vikki [24]

<h3>Given :</h3>

AB = 7
∠A = 45°

BC = ?
AC = ?

<h3>Solution :</h3>

From point A,

$\bf tan A = \dfrac{perpendicular}{base}$

$\bf \implies tan A = \dfrac{BC}{AB}$

$\bf \implies tan A = \dfrac{BC}{7}$

Now, we are given ∠A = 45°

$\bf \implies tan A = tan 45^{\circ}$

$\bf \implies tan 45^{\circ} = \dfrac{BC}{7}$

Now, we know that tan45° = 1

$\bf \implies 1 = \dfrac{BC}{7}$

$\bf \implies 1 \times 7 = BC$

$\bf \implies BC = 7$

Now, by Pythagoras' theorem,

AC² = BC² + AB²

$\bf \implies AC^{2} = (7)^{2} + (7)^{2}$

$\bf \implies AC^{2} = 49 + 49$

$\bf \implies AC^{2} = 98$

$\bf \implies AC = \sqrt{98}$

$\bf \implies AC = 7 \sqrt{2}$

$\pink{\bf \therefore \: values \: of \: AC = 7 \sqrt{2} \: and \: BC = 7}$

8 0

3 years ago

A narrator who is also a character in the story is?

diamong [38]

b. second person or c. third person limited, depending on how the narrator describes the scene. If the narrator says "you do this, you do that..." etc., than its second person, if the narrator acts as a character in the story and talks as if they're talking to you, describing a story, ("He is bad. She is good.") than its c. third person limited.

It could also be that the narrator is the main character describing the scene as "I like this, I like that." In that case, it would be a. first person

5 0

4 years ago

Read 2 more answers

How do you workout 28 divided by 812

alina1380 [7]

Answer:

29

Step-by-step explanation:

Look at image

8 0

3 years ago

Read 2 more answers

Which of the following is not a polynomial identity?

olga_2 [115]

Answer:

Option B

Step-by-step explanation:

Option A

a² - b² = (a+ b)(a - b)

It's a polynomial identity.

Option B

a³ + b³ = (a - b)(a² - ab + b²)

It's not a polynomial identity.

Because the identity is,

a³ + b³ = (a + b)(a² - ab + b²)

Option C

a³ - b³ = (a - b)(a² + ab + b²)

It's a polynomial identity.

Option D

(a²+ b²)(c² + d²) = (ac - bd)² + (ad + bc)²

= a²c² - 2abcd + b²d² + a²d² + b²c² + 2abcd

= a²c² + b²c² + b²d² + a²d²

= c²(a² + b²) + d²(a² + b²)

= (a²+ b²)(c² + d²)

Therefore, it's a polynomial identity.

Option B will be the answer.

7 0

3 years ago

What’s the 5th term is 2,14,98

iragen [17]

$\bold{\huge{\orange{\underline{ Solution }}}}$

<h3>Correct Question :-</h3>

What is the 5th term of an AP 2 , 14 ....98 .

<h3>Given :- </h3>

We have AP, 

$\sf{ 2 , 14 ,.... 98 }$
AP is the arithmetic progression or a sequence of numbers in which succeeding number is differ from preceeding number by a common value.