So you need to make out the lengths for the triangle. For the height, you can subtract the short length (100) from the longer length (1250) to get the height of the triangle. The base is the length at the very top, 75. So right now you have 150 for height and 75 for the base. Now use the formula to get 75 root 5.
        
             
        
        
        
Answer:
a = -4
b = 5
c = -2
(That's the 3rd line you posted)
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Answer:
I think it is 52. 
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Answer:    12    x    15= 180 cuadrados 
juas juas juas 180  +   180  = 360 
15 x 15 cm = 360
Step-by-step explanation: