Answer:
All the lateral faces in a triangular pyramid are congruent.
Step-by-step explanation:
- A triangular pyramid is a pyramid that has a triangular-shaped base.
- It has equilateral triangles which are equilateral.
- The pyramid is also known as tetrahedron because the base is of triangular shape.
- There are four faces and a triangular base in a triangular pyramid.
- There are four vertices and six edges.
Total number of outcomes of 7 from 10 = 10*9*8 / 3*2*1 = 120
probability of each outcoe is 0.85^7* (0.15)^(3) = 0.0010819
Required probability = 120 * 0.0010819 = 0.1298
Answer:
b=73a-121
Step-by-step explanation:
a-b/12=11-6a
Let's start solving
Cross multiply
a-b=12(11-6a)
a-b=121-72a
Collect like terms
a+72a=121+b
73a=121+b
Substrate 121 from both sides
73a-121=b
Therefore b=73a-121
Which means that b has been made the subject of formula
Adjacent and hypotenuse are given so use cosine.
Cos28= 11/x
12.46 is your answer (I rounded)