Step-by-step explanation:
the lengths OB, OC & BC together forms a isosceles triangle.
therefore,
OB=OC
3x+4=x+8
2x=4
x=2.
OB = 3x+4= 3.2+4=10cm.
OC= x+8= 2+8=10cm.
therefore, the diagonals are : 20cm each.
hope this helps you.
The answer is the option A, which is: A. Equilateral triangles.
The explanation for this answer is shown below:
By definition, a tetrahedron is a solid in three dimensions that has: six sides, four vertices and four triangular faces. These faces are equilateral triangles, which means that all the sides are equal and all the interior angles measure 
degrees.
The tetrahedron is also called "triangular pyramid".
Answer:
20 bottles
Step-by-step explanation:
Number of bottles
Answer:
Part A: 41
Part B: 131
Step-by-step explanation:
PART A: Since a complementary angle is one that adds up to a total of 90 degrees the complement of 49 should be 41
90-49=41
PART B: Since a supplementary angle is one that adds up to a total of 180 degrees the supplement of 49 should be 131
180-49=131
Hope this helps!!! :)
Yards and meters because they has a good measurement. A mile and kilometer is way to big. A kilometer is 1000 meters and a mile is 5280 feet to be exact.
