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3 years ago

Find the value of xxx in the triangle shown below.

Mathematics

2 answers:

klasskru [66]3 years ago

6 0

Answer: 50°

Step-by-step explanation:

First, we can see that this is an isosceles triangle! That means the two angles at the bottom are the same.

A triangle's angles all equal 180 when added together, so knowing this, lets work backwards

180 - 80 = 100

Now, the two angles at the bottom are the same, so lets just divide 100 by 2, and our answer is 50!

Hope this helps :)

Ganezh [65]3 years ago

4 0

Answer:

x = 50°

Step-by-step explanation:

x = (180 - 80) ÷ 2

= 100 ÷ 2

= 50°

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3 years ago

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2 years ago

The value of x in the expression<br> 2x/3 - 7 = 5 is

Andrej [43]

Answer:

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Step-by-step explanation:

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Multiply both sides if the equation by 3 : 2x - 21 = 15

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3 years ago

Using addition formula solve tan 15

salantis [7]

Answer:

2 - $\sqrt{3}$

Step-by-step explanation:

Using the addition formula for tangent

tan(A - B) = $\frac{tanA-tanB}{1+tanAtanB}$ and the exact values

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tan(60 - 45)°

= $\frac{tan60-tan45}{1+tan60tan45}$

= $\frac{\sqrt{3}-1 }{1+\sqrt{3} }$

Rationalise the denominator by multiplying numerator/ denominator by the conjugate of the denominator.

The conjugate of 1 + $\sqrt{3}$ is 1 - $\sqrt{3}$

= $\frac{(\sqrt{3}-1)(1-\sqrt{3}) }{(1+\sqrt{3})(1-\sqrt{3}) }$ ← expand numerator/denominator using FOIL

= $\frac{\sqrt{3}-3-1+\sqrt{3} }{1-3}$

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3 years ago

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Ksivusya [100]

Answer:

ASA

Step-by-step explanation:

∠BAC ≈ ∠CAD

AC = AC

∠BCA ≈ ∠ACD

5 0

3 years ago