2 years ago

in a triangle PQR, p=7.5cm, q=10cm, r=9.1cm. find the largest angle in the triangle using cosine rule.

Mathematics

1 answer:

Aloiza [94]2 years ago

5 0

73.37°

Mark brainliest please

Hope this helps you

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How do I solve this

sdas [7]

$\bf \textit{difference of squares}
\\ \quad \\
(a-b)(a+b) = a^2-b^2\qquad \qquad 
a^2-b^2 = (a-b)(a+b)\\\\
-------------------------------\\\\
\cfrac{2x}{x^2+2x-24}-\cfrac{x}{x^2-36}\quad 
\begin{cases}
x^2+2x-24\implies (x+6)(x-4)\\
--------------\\
x^2-36\implies x^2-6^2\\
(x-6)(x+6)
\end{cases}$

$\bf \cfrac{2x}{(x+6)(x-4)}-\cfrac{x}{(x-6)(x+6)}\impliedby 
\begin{array}{llll}
\textit{thus our LCD is}\\
(x-6)(x+6)(x-4)
\end{array}
\\\\\\
\cfrac{[(x-6)2x]~-~[(x-4)x]}{(x-6)(x+6)(x-4)}\implies \cfrac{2x^2-12x-x^2+4x}{(x-6)(x+6)(x-4)}
\\\\\\
\cfrac{x^2-8x}{(x-6)(x+6)(x-4)}$

3 0

3 years ago

The surface area of a square pyramid is 189 in.². The side length of the base is 7 inches. What is the value of X?

alina1380 [7]

Not enough information is given to put an absolute answer it there could be a million reason like d332 nut5 for example

8 0

2 years ago

Two more than a certain number is 15 less than twice the number. Find the number

Svetllana [295]

2+x=2x-15
>> 2+15=2x-x
>> 17 = x

So the answer is <u>17</u>

6 0

3 years ago