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Verified answer
Menggunakan dalil phytagorasa^2+b^2=c^2
2^2+8^2=c^2
4+64=c^2
√68=c
√4×√17=c
2√17=c
jadi panjang tangga adalah 2√17meter
jarak kaki ke tembok = x
jarak tanah ke ujung tangga = y
panjang tangga = z
z² = x² + y²
x² = 2² + 8²
x² = 4 + 64
x² = 68
x = √68
x = √(4 x 17)
x = 2√17 meter