Law of cosine:
c² = a² +b² -2ab*cosC.
Because the triangle is equilateral a=b=c=x,
and we can write,
x²=x² +x² -2xx*cosC
x² =2x² -2x²* cos C
-x² = -2x²*cos C
cos C= 1/2,
so m∠C=60⁰.
Because all sides are equal, and across of the equal sides should be equal angles, all angles will be also equal and = 60⁰.
You can fit<span> 4679 dimes into a </span>2 liter bottle<span>.</span>
Answer:
The area of the rhombus is 
Step-by-step explanation:
we know that
To find the area of a rhombus, multiply the lengths of the two diagonals and divide by 2
Answer:
m = -2/3 and the equation is y = -2/3 x -5
Step-by-step explanation:
Slope = y2-y1/x2-x1 so -3+5/-3-0, so m = -2/3
Put it all together y = -2/3 x -5 since (0,-5) is the y intercept since x = 0
