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3 years ago

Please help me. Is that right?

Mathematics

2 answers:

Alex17521 [72]3 years ago

6 0

Answer:

Angle 5

Step-by-step explanation:

zepelin [54]3 years ago

4 0

Answer:

Yes

Step-by-step explanation:

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Given: △ABC, m∠A=60°

Anon25 [30]

Answer:

Perimeter = 32.3

Area = 95.24

Step-by-step explanation:

Given:

△ABC, m∠A=60°

m∠C=45°, AB = 9

To find:

Perimeter of △ABC

Area of △ABC

Solution:

Using angle sum property in a triangle:

m∠A + m∠B + m∠C = 180°

m∠B = 180° - 45° - 60° = 75°

As per Sine Rule:

$\dfrac{a}{sinA} = \dfrac{b}{sinB} = \dfrac{c}{sinC}$

Where

$a$ is the side opposite to $\angle A$

$b$ is the side opposite to $\angle B$

$c$ is the side opposite to $\angle C$

$\dfrac{BC}{sin60^\circ} = \dfrac{AC}{sin 75^\circ} = \dfrac{AB}{sin 45^\circ} \\\Rightarrow \dfrac{BC}{\frac{\sqrt3}{2}} = \dfrac{9}{\frac{1}{\sqrt2}} \\\Rightarrow BC = 12.73\times 0.87 \\\Rightarrow BC = 11.08$

$\Rightarrow \dfrac{AC}{0.96} = \dfrac{9}{\frac{1}{\sqrt2}} \\\Rightarrow AC = 12.73\times 0.96 \\\Rightarrow AC = 12.22$

Perimeter of △ABC = AB + BC + AC = 9 + 11.08 + 12.22 = <em>32.3</em>

Area of a triangle is given as:

$\dfrac{1}2\times ab sin(angle\ between\ a\ and\ b)$

$\Rightarrow \dfrac{1}{2}\times AB\times AC\times sinA\\\Rightarrow 9\times 12.22\times sin 60\\\Rightarrow \bold{95.24}$

8 0

3 years ago

Which equation could he have solved? Is it A or B

Artist 52 [7]

A or B ....it’s your choice

7 0

3 years ago

PLEASE ANSWER!! WILL MARK BRAINLIEST

natulia [17]

The Answer I think is 21

5 0

3 years ago

So confused. There is a link to the picture :)

user100 [1]

An = a1 + (n-1)d

an = 27 + (n-1)(-6)

4 0

3 years ago

Write the decimal using unit 90 rupees 75 paise

Klio2033 [76]

Answer:

Rupees 90.75

Step-by-step explanation:

As 75 p is equal to 0.75 rupees.
therefore 90+0.75=90.75 answer.

7 0

3 years ago