Answer:
B
Step-by-step explanation:
Side AB= Side DE
Angle B=90 Angle E=90
Side BC= Side EF
Therefore, they are congruent because of the SAS(Side Angle Side) Postulate.
if there's 1 boy to every 4 girls, there's going to be 5 boys for every 20 girls
A tetrahedron is a triangular pyramid. It has four triangular faces and four vertices.
In the question, we are told that the length of the edges are all equal = 20m and the length from one corner to the center of the base = 11.5m
We sketch a diagram of a tetrahedron with the given measurement as shown below
To find the height, we will use the Pythagoras theorem
20² = h² + 11.5²
h² = 20² - 11.5²
h² = 267.75
h = √267.75
h = 16.36 (rounded to two decimal places)