What is the value of x?

Mathematics

2 answers:

anastassius [24]3 years ago

5 0

The unknown angle is 80°. There is a simple formula to figure out the unknown angle. Add the angles and then subtract the sum of the two angles from 180. You would do this because the sum of interior angles of a triangle is 180°.

x=180°-(angle 1 + angle 2)

Anna11 [10]3 years ago

3 0

A triangle should equal 180,

30+70 = 100

100-180 = 80

So x=80

30+70+80= 180

Hope this helped! and mark brainliest please if you could ((:

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Which equation correctly uses the law of cosines to solve for the missing side length of trianglepqr? 62 = p2 82 – 2(p)(8)cos(39

Evgesh-ka [11]

The equation that correctly uses the law of cosines to solve for the missing side length of trianglepqr is 8^2 = 7^2 +11^2 - 2(7)(11) cos <P

<h3>The cosine rule formula</h3>

For us to use the cosine formula, an angle must be situated between two sides of the triangle.

According to the rule;

c^2 = a^2 + b^2 - 2ab cos C

From the given diagram, if cos<P is the reference angle, then;

a = 11

b = 7

c = 8

Substiute

8^2 = 7^2 +11^2 - 2(7)(11) cos <P

Hence the equation that correctly uses the law of cosines to solve for the missing side length of trianglepqr is 8^2 = 7^2 +11^2 - 2(7)(11) cos <P

Learn more on law of cosine here: brainly.com/question/8288607