Answer:
c) three
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Step-by-step:
The tetrahedron is a triangular pyramid with equilateral triangles on each face.
Answer:
This should be correct ( I havent done it in 3 years but it seems right)
Step-by-step explanation:
1.c≈15.71
2.c≈31.42
3.d=12.5
Answer:
Hence as long as x > 2/3, we can form a triangle from the three given sides.
Step-by-step explanation:
Given:
Length of 3 sides of triangle are 
Solution:
From the length of the 2nd side 4x, we know that x > 0
Let this be 1 st statement.
Now from the triangle inequality we can say that;

No new information from this because of the 1st statement above.
Also,

Lastly,

and again no new information is obtained from this inequality.
Hence as long as x > 2/3, we can form a triangle from the three given sides.
Answer: .
Step-by-step explanation: .
Answer:
Step-by-step explanation:
x^2 = 256 + 12^2