Answer:
the whole triangle is 180° 
Step-by-step explanation:
63 + 68 = x 
180° - x = y 
y = the answer
 
        
             
        
        
        
If each face is 80m² and there are 4 identical faces, the answer would be 4 x 80 = 320m² - C
        
             
        
        
        
Answer:
34 years
Step-by-step explanation:
To begin even finding this ages you would have to find the 2 numbers in which (when multiplied) equal 2015. The numbers I have found that are most reasonable include:
65 and 31.
65 x 31 = 2015
So the difference:
65 - 31 = 34
 
        
                    
             
        
        
        
Answer:
   6.83 units
Step-by-step explanation:
Let the height of the original pyramid be represented by h. Then the cut off top has a height of (h -2). The scale factor for the area is the square of the scale factor for height, so we have ...
   (height ratio)^2 = 1/2
   ((h -2)/h)^2 = 1/2
   (h -2)√2 = h . . . . . . square root; multiply by h√2
   h(√2 -1) = 2√2 . . . . add 2√2 -h
   h = (2√2)/(√2 -1) ≈ 6.8284 . . . units
The altitude of the original pyramid is about 6.83 units.