A triangle with 45 cm of perimeter has 15 cm of side. The
"altitude" connects the middle of one side to the opposite vertice. This forms a rectangle triangle with hypothenuse 15 cm and the small catet a= 7.5 cm. So by the Pythagoras theorem we must solve the equation:
7.5^2+b^2=15^2
b=sqrt(225-56.25)=sqrt(168.75)=12.99 cm
Other solution was using trigonometry:
b/(side)= sin(pi/3)=sqrt(3)/2
b=7.5*sqrt(3)/2=12.99 cm
<span>In order to subtract larger numbers, such as these three digit numbers, it is beneficial to write the numbers in a single column in two rows. Place the larger number in the first row and the smaller one in the second row. After that, start subtracting the numbers starting from the right-most number; you may need to carry over numbers if the number on top is smaller than that at the bottom. The answer of this subtraction is 232.</span>
Answer:
37
Step-by-step explanation:
When u read it its saying 8-19=-11+48=37
Let’s say the unknown number is x.
therefore,
(2x)^2/3 - 30= 18
4x^2/3 -30 = 18
4x^2-90/ 3 = 18
multiply 18 by 3, and 4x^2-90 by 1
hence,
4x^2-90 = 54
4x^2=144
x^2= 144/4
x^2= 36
x=+ or - 6
hope it helps:)
