回答:
# "12 cm"#
説明:
から # "ピタゴラスの定理"#
# "h" ^ 2 = "a" ^ 2 + "b" ^ 2#
どこで
- # "h ="# 斜辺の長さ
- # "a ="# 片足の長さ
- # "b ="# 他の足の長さ
#( "20 cm")^ 2 =( "16 cm")^ 2 + "b" ^ 2#
# "b" ^ 2 =( "" 20 cm ")^ 2 - (" 16 cm ")^ 2#
# "b" = sqrt(( "" 20 cm ")^ 2 - (" "16 cm")^ 2)#
# "b" = sqrt( "400 cm" ^ 2 - "256 cm" ^ 2)#
# "b" = sqrt( "144 cm" ^ 2)#
# "b = 12 cm"#