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TEA [102]
3 years ago
8

PLSSS ANSWER!!!!!!!!!!!!

Mathematics
1 answer:
Brums [2.3K]3 years ago
5 0

Look at the picture.


The formula of an area of a triangle:


A_\Delta=\dfrac{1}{2}ab\sin\alpha


In the equilateral triangle, the measures of all angles are the same and equal to 60°.


Therefore your answer is:


\dfrac{1}{2}aa\sin(60^o)=\dfrac{1}{2}a^2\sin(60^o)

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Answer:

-4 degrees c

Step-by-step explanation:

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Well, 8-12=-4

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(っ◔◡◔)っ ♥ Hope this helped! Have a great day! :) ♥

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2 years ago
The width of a rectangle is 7 inches less than its length. The area of the rectangle is 120 square inches. Solve for the dimensi
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3 years ago
A quadrilateral has two angles that measure 222° and 81°. The other two angles are in a ratio of 6:13. What are the measures of
hram777 [196]

\sf\huge\underline{\star Solution:-}

\rightarrow <u>Ratio of two angles are 6:13.</u>

So, let the one angle be \sf{6x} and another be \sf{13x.}

As we know that,

Sum of all interior angles of a quadrilateral = \sf\pink{360°.}

So let's sum up the given angles,

\rightarrow \sf{222°+81°+6x+13x \:=\:  360°}

\rightarrow \sf{303+19x \:=\:  360°}

\rightarrow \sf{19x \:=\:  360-303}

\rightarrow \sf{19x \:=\:  57}

\rightarrow \sf{x \:=\:  \frac{19}{57}}

\rightarrow \sf{x \:=\:  3}

Hence, \sf{x \:=\:  3}

So, First angle \sf{= \:6x\: = \:6×3 \:=} \sf\purple{18°.}

Second angle \sf{= \:13x\: = \:13×3 \:=} \sf\purple{39°.}

_________________________________

Hope it helps you:)

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2 years ago
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