Step-by-step explanation:
6) they forget the last step which is to take the square root of the sum
7) a = 4
b = 17
a² + b² = c²
4 ² + 17 ² = c²
16 + 289 = c²
305 = c²
√305 = c
17.464249196572980 = c
8) need to find the length of the last side of the triangle (so the same as (7) )
a²+b²=c²
30²+40²= c²
900 + 1600 = c²
2500 = c²
√2500 = c
50 = c
now we need to find out how many m we saved
original walk = 30+40 = 70
shortcut = 50
meters saved = 70-50 = 20 m
as for 3&4 i don't have time to draw sorry
